Alton Towers is suitable for all ages, and your 4-year old will love it. I hope you do too, of course. Even if you don't feel up to Air, Oblivion or Nemesis, there's plenty of other adult fun. I liked the Black Hole (a roller coaster in the dark!), Runaway Train, the Haunted House and the River Rapids. Your 4-year old will like the Farm and the kiddy coaster type rides, the story-telling book and little cars that take them round winding tours. Your kid will be smiling from ear to ear even if you aren't, but I'm sure you'll like it too. Oh and if you go on the cable car ride across the park you get a smashing view, and look out for squirrels - these amazing little creatures have no fear of heights and can be found up the cable car pylons. Alton Towers itself is a ruined house with a history and is well worth a visit. A great family day out.