We have just spent a few days in Blackpool and I loved it I know it's got to be your tastes but my DD (5) had the best time.
However me and DH were on one of the piers which was so run down and rusty and at night there was a few drunken parents (I know people like a drink on holiday) but there was young kids practically hanging over the edge which brought us to wonder of many people/kids have fallen off?
I can't imagine there would be none it's so unsafe