Fun places for an average 20 year old to visit in England?

I'm looking for some places to visit in England, sick of doing the same thing over and over in my boring town, need to adventure. Looking for places to visit, like if you are 18-25 (not being ageist here). Where have you been that you've really enjoyed? I don't want to go sight seeing or museums. Places like Alton Towers, or huge play zones. Thanks.