Thanks for the suggestions, Mrs Egg has come up with going up Mount Snowdon on a train.
I have 'stated', quite boldly I may add, that I AM going to Cearnarvon Castle, looks about a 3 hour drive but it is a serious Title Contender in the Castle Premier League.
be impressed if you can do it in 3 hours. Carnofon is good, as are Harlech and Beaumaris. f*** the railway, get your walking boots out.