Lappa Valley is at St Newlyn East, five kilometres south of Newquay, and it is built around a 15-inch gauge railway running from Benny Halt to East Wheal Rose.
The trip out is the arrival: you park, you get on a small steam or diesel train, and it takes you a mile and a half through a wooded valley to a site you cannot otherwise reach. Children treat this as magic, and the effect is real.
Three separate miniature railways operate on the site.
The main line — 15-inch gauge, steam-hauled on most operating days, running from Benny Halt to East Wheal Rose along the trackbed of the old Newquay to Chacewater branch, closed in 1963.
The Woodland Railway — 10¼-inch gauge, running a loop through the trees.
The Canyon Railway — 7¼-inch gauge, the smallest.
Children can and do ride all three repeatedly, which is a substantial part of how the day is spent.
The destination is not arbitrary. East Wheal Rose was a lead mine, and in 1846 it was the site of the worst mining disaster in Cornish history: a freak thunderstorm flooded the workings and 39 men and boys drowned.
The engine house still stands at the site — a proper Cornish engine house, and the reason the valley has the shape it does.
The interpretation is present but light; this is a family attraction rather than a memorial, and it handles the history with reasonable tact.
A boating lake with pedalos and canoes.
A maze, and a second brick-paved maze.
Crazy golf.
Adventure playgrounds, several, across age bands.
An indoor play area — which matters, because it makes the site workable in rain.
A café with food that visitors specifically praise, plus ice cream and a gift shop.
Woodland walks round the valley.
The recurring description is of a spotlessly clean, well-run, unpretentious site with staff who are noticeably good — people name them in their accounts, which is unusual and tells you something about how the place is run.
Two to nine is the core, and it is close to ideal for a four- or five-year-old. Older children will enjoy the pedalos and the maze but will be done sooner.
Time: most of a day. Families routinely stay four to six hours.
Admission includes the railways and all the activities on site — one ticket, no extras, which is unusual and is a large part of why the value is rated so highly.
Season: roughly April to October, with reduced operating days at the shoulders. Check operating days before travelling, especially outside high summer.
Steam: not every day. If steam specifically matters, check the timetable.
Parking: free at Benny Halt.
Facilities: café, shop, toilets, baby changing, picnic areas.
Access: the site is largely level; the trains have steps.
Weather: mostly outdoors, with an indoor play area and café as cover.
St Newlyn East, off the A3075 south of Newquay, about fifteen minutes by road and signposted.
Trerice, the National Trust Tudor manor, is five minutes away and makes a good pairing for a family with a range of ages.
Newquay is fifteen minutes north.
The railways and all the on-site activities — pedalos, mazes, crazy golf, play areas — on one admission.
The main 15-inch line runs steam on most operating days, but not all. Check the timetable if it matters.
Most of a day — four to six hours is typical.
Roughly two to nine, and it is close to ideal for four- and five-year-olds.
No — it runs roughly April to October with reduced days at the shoulders. Check before travelling.