Everyone motors past Fermanagh on the way to the coast. Their loss. This one lake-filled county packs in a boat trip on an underground river, a monastery on its own island, two of the grandest houses in Ireland and the most famous staircase in the country — a full holiday's worth of days out.
The shape of it — everything spins around Lough Erne. Enniskillen sits in the middle with its castle and the island boats, the big estates ring the water, and the Marble Arch Caves and Cuilcagh boardwalk pair up in the same Geopark near Florencecourt.
Cost — Castle Archdale and Monea are completely free, the Cuilcagh walk is free too (£6 to park at the trailhead, or a free car park about 1km back), and on Devenish the island itself is free — you pay only the boat fare. National Trust members walk into Castle Coole, Florence Court and Crom for nothing.
Book the caves, check the boats.Marble Arch tours are pre-booked only and heavy rain can shorten or close them at short notice; the Devenish and White Island boats are seasonal — confirm sailings before you travel.
Cuilcagh is a proper mountain walk — 3 to 4 hours, roughly 13km, no shelter and no toilets on the trail, and the weather turns fast. Boots and waterproofs, not trainers and hope.
Food — the Tallow House tea-room at Castle Coole, Florence Court's tea-room, a café at the Marble Arch visitor centre and Granny Flo's at the Fun Farm. Around the castle, Enniskillen's cafés are a short walk away.
When — spring to autumn is the sweet spot: house tours run roughly March to October and the lough boats are busiest in July and August. Monea, Castle Archdale and the boardwalk stay open all year.
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Marble Arch Caves
Florencecourt · ~£12.50 adult, ~£8 child · Pre-booked tours only
A guided walk deep under Fermanagh through one of the finest show-cave systems in Ireland — floodlit chambers of stalactites, black pools that mirror the roof, and when the water's right, a boat glide along an underground river. Tours last about an hour to 75 minutes underground; allow two with the visitor centre and café. It's a steady 9–10°C down there with around 154 steps, so bring a fleece and grippy shoes — brilliant from about age 5 up.
About 2 hours~£12.50 adult · family ~£39Book ahead — heavy rain can shorten or close tours at short notice
The Stairway to Heaven — a timber boardwalk laid dead straight across wild blanket bog, then a steep flight of about 450 steps up the mountainside to a viewing platform with one of the finest views in the county. It's a proper walk: 3 to 4 hours and roughly 13km there and back, exposed the whole way. The bog itself is a protected conservation area thought to have taken thousands of years to form, so no dogs, and carry out everything you carry in.
3–4 hoursFree walk · £6 car park (free one ~1km back)No shelter or toilets on the trail — boots, waterproofs and layers
Enniskillen · NT members free · House by guided tour
A pale, palace-like mansion in gleaming Portland stone — shipped over from Dorset in the 1790s for the Earls of Belmore — sitting in around 700 acres of parkland on the edge of Enniskillen. The state rooms are shown by a guided tour of about an hour, right down to the basement where the servants worked. Outside, level lakeside and woodland walks circle Lough Coole and its long-established colony of greylag geese, and the Tallow House tea-room does hot lunches.
Half a dayTallow House tea-room & bookshopHouse tours run roughly March–October — check before you travel
Lough Erne, near Enniskillen · Island free · Boat fare ~£10–£15 adult
A superb 12th-century round tower and grey priory ruins standing alone on a green island in the middle of Lough Erne — one of the best-preserved round towers in Ireland, about 25m tall, beside a 15th-century high cross and an atmospheric old graveyard. There's no bridge: you cross by seasonal boat, mainly the guided trip from the Round 'O' Jetty in Enniskillen, and in high summer a cheaper foot-passenger ferry has historically run from Trory Point. The island itself is free — you pay only the fare.
Boats roughly spring–autumnIsland free · pay the boat fare onlyConfirm the boat is sailing before you travel — few facilities on the island
Enniskillen · Members free · Grounds from ~£9.50 adult
A tall grey Georgian house with colonnades sweeping out like open arms, sitting under the Cuilcagh mountains — with swirling rococo ceilings the National Trust rates among the finest in Ireland, a walled garden coming back to life, and a forest park with around ten miles of waymarked trails behind it. On the Blue Trail stands the Florence Court Yew, said to be the tree every upright Irish yew in the world descends from, thought to be around 250 years old. Half a day for the house, a full day with the boots on.
Half a day to a full day~£15 adult full ticket · members freeHouse tours are booked on arrival and fill on busy weekends — come early
Enniskillen · Modest paid entry · Family tickets available
A waterside castle right on the River Erne, its twin-turreted Watergate the postcard image of the town — with two museums under one roof. The Fermanagh County Museum covers the county's story from prehistory to its famous Belleek pottery, and the Inniskillings Museum tells the tale of the regiments that carried the town's name around the world. Allow 2 to 3 hours for both plus the keep and grounds, with the town's cafés a short walk away.
2–3 hoursModest entry · family ticketsOpening days shift with the season — check before you set off
Newtownbutler · Members free · Non-members pay entry & parking
Around 2,000 acres of ancient woodland, islands and lakeshore on Upper Lough Erne — romantic Old Castle ruins by the water, a Gothic stone boathouse, and the intertwined Crom Yews, said to be among the oldest trees in Ireland. This is one of Ireland's most important nature conservation areas and a stronghold for red squirrels and pine martens, so keep quiet and watch the trees. Long flat lakeside trails suit little legs, and dogs on leads are welcome across the estate.
Half a day to a full dayNT members free · others pay entry & parkingTea room, boat hire & visitor centre are seasonal — check before you go
A big free country park on the shore of Lower Lough Erne with a marina full of boats — hire a kayak, canoe or boat, walk the woodland and lough-shore trails, and find the red deer enclosure and butterfly garden. The visitor centre holds the Castle Archdale at War museum, where flying boats once hunted U-boats from this very shore. From the marina you can also get out to White Island, where eight carved stone figures, thought to be well over a thousand years old, stand in a ruined church.
Half a day, easily a full oneFree entry · free parkingWhite Island boats are seasonal & weather-dependent — ask at the marina
Near Enniskillen · Free · Open access in daylight hours
A tall, roofless Plantation castle you walk right up to and into — completely free, nothing to book — its two big round towers capped with unmistakable Scottish-style turrets. It's said to be the best-preserved Plantation castle in Ulster, reached by a short walk through a beech-lined avenue, and most people give it a happy 30 to 45 minutes. No café and no toilets, just a small car park, an information board and a ruin that looks borrowed from a storybook. It sits on working farmland, so leave the dog at home.
30–45 minsFree · no tickets, everOpen ruin with drops and uneven ground — keep small children close
The little-ones finisher — a hands-on family farm near Enniskillen where one ticket covers the whole day: a basket of feed for the goats, ponies, donkeys and alpacas, a pony walking and grooming session, and a pet-handling session, all included. A big indoor play barn and a shed of ride-on pedal tractors make it a genuine rain-or-shine day, and Granny Flo's tearoom does hot food. Adult £8.50, child £9.50, family of four £32.50 — and booking online gets a discount.
Half a dayFamily of four £32.50 · book online to saveRuns mainly Sat–Sun, closed over winter — check the day before you travel
The showstopper: Cuilcagh boardwalk in the morning while legs are fresh, then a booked Marble Arch Caves tour in the afternoon — both sit in the same Geopark near Florencecourt.
The lough day: the Devenish Island boat from Enniskillen first, then the two museums at Enniskillen Castle, and a late lunch in the town's cafés.
The free day: Castle Archdale's marina, deer and flying-boat museum in the morning, a picnic by the lough, then Monea Castle in the evening light. Total spend: whatever the picnic cost.
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