I just don't understand how people don't use their imagination or nous. There are many things to do to get about beyond a rail head around the country. Public Transport is one the other is local tours. I can give you an example of a tour from St. Ives (my backyard I'll admit) which are either by coach or mini-bus.
From St. Ives towards Lands End along the B3306. Along to Zennor, the church, the pub, (Tinners Arms. Great pub food. Newlyn Crab a must) a walk down to the cliffs. Then, on past miserable Morvah, Pendeen and the Geevor Tin Mine, with the Man Engine (if he's not on tour). On to Bottalack to see The Crowns, Cape Cornwall, Get the photo taken at Lands End and then travel back via the Minack Theatre, pop around to the Telegraph Museum at Portcurno and then back to St Ives via St Buryan, Mousehole, and Penzance, and the B3311, via Nancledra and you have a good days tour of Penwith. Lovely on a sunny day, even better when it's blowing a force 7 straight off the Atlantic.
Other trips to St Michaels Mount, The Lizard, I know of day trips to Tintagel, Eden, and even to (Spits on the ground) North Devon.
OK you've got to fork out a few quid for the tour, but you're on holiday! Someone else is doing the driving for you. You are investing in the local economy, seeing places you might see only once in your life and seeing the history. You're doing a Portillo but you got to your base by train and making your way around the area using public or private transport. Shock horror, you could even hire a car locally and do your own tours.
I now live out of the UK. Recently, Easter week, I flew to Perth, had two nights there, used a local rail rover ticket to see the area, then took the Indian Pacific to Adelaide and Sydney, saw a lot of nothing, and a few interesting places on route. From Sydney I went up to Brisbane and had four days roving around the Gold Coast, and West of Brisbane by rail. Had a fantastic time. Did I drive myself. Hell No.
I try to get back to the UK annually and I always go home to West Cornwall, and get around using a Rover ticket. I also visit other places when I'm back in the UK. Three years so so back I covered the West Highland line to Mallaig. I took the ferry to Skye one day, did a coach tour, the next day I took the ferry to Canna,and had a lovely time, nice sunny and quiet, even in Mid October.
I'm sure that with a bit of imagination people can get about and see interesting things, even out of Skegness when it's closed.