I went to Legoland Discovery Centre (Manchester) and couldnt believe the price for what it was. We were round it in an hour.
I live in Blackpool, its made for kids/big kids. I cant say I love the place or that I find it 'amazing' but holiday makers seem to love it;
The Pleasure Beach - It has the new Nikelodeon land now
Piers/lots of Arcades
The Beach
Zoo
Sealife Centre
Ripleys Oddatorium
2 Ice Skating rinks
Go Karting
Lots of shows on; Winter Gardens or Grand Theatre
Waxworks - which has just been re-done and is really good fun
The Tower - Which has Jungle Jims & The Tower Circus etc inside (-its Dungeons are still being renovated..)
& im sure loads more