If you can time your day to be on one of these tours you may find it useful- https://www.foscl.org.uk/content/ribblehead-tours
The web page is a bit short on detail but the Navvy Walk and Theatre goes past Ingleborough nature reserve Gauber High Pasture and past an old Norse [Viking] settlement and Great Douk Cave to St Leonard's Church, Chapel-le-Dale where many of the navvies are buried (for the open air theatre show).
Last year's leaflet for these walks had a wonderfully detailed map of the shanty towns at Ribblehead on the back page. Hopefully the leaflets or maps will be at [Ribblehead Station Visitor Centre][1]- I've not yet found a printed copy this year and it has vanished off the FoSCL website.
Do patronise the catering trolley between Appleby and Settle as profits from that directly support the line, and the trolley also supports local producers.
At Horton in Ribblesdale (an alternative stop to Settle) a lot of work is happening at the station. The building is being converted into a holiday let and a cafe/bar, a foot bridge (and elevator/lift) is being installed and the whole place being given a good makeover- all due to a new siding being installed for a re-opened quarry. There would also be time enough to go down to the village and see the St Oswald's Church . All that is underway- won't be finished for May, but hopefully open during the summer. Horton is one of the main starting points for the Three Peaks Walk, and at weekends can get pretty busy.
If you go to Settle try to time it for when the town's Folly Museum is open, and look into the Victoria Hall if you can- a lovely former Music Hall. Also the scene of so many of the meetings when the line was threatened with closure.
As has happened at other stages on the line Horton station will be totally rejuvenated while retaining all it's historical features. So it will join Kirkby Stephen West and Dent as stations you can stay at on the line.
The only steam train I can see over the line in May is on Saturday 25 May when the Northern Belle Pullman luxury train is visiting on a Darlington to Carnforth to Carlisle service (timings to be advised). The Midland Pullman (diesel) is also running that day on an Ayr to Blackpool charter.
On Saturday 11 May the Midland Pullman also comes north on a St Albans to Carlisle service.