Over the last 18 months I've been introduced to the joys of the trailer park holiday. I particularly like the luck of the draw when it comes to whether or not the caravan you're in feels like a deathtrap or somewhere you could comfortably live.
My favourite so far was in France, which had a strong horror film aesthetic:
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Others have all been in the UK: Skegness, Ayr, Clacton and Helmsley.
If you're not fussy about when you want to go (ie unencumbered by dependents), and genuinely appreciate a vaguely scruffy seaside town (although Helmsley doesn't fall into that category, it was fancy) then you'll have nothing to complain about.