If your break falls within school holidays, particularly the summer holidays or half terms, book as early as you reasonably can, ideally several months ahead. These are the weeks every family with school-age children is trying to book at the same time, so the best weeks, and often the more sought-after units within those weeks, go first. Waiting until a few weeks before a summer half term usually means choosing from whatever's left rather than what you'd actually prefer.
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coastal caravan holidays holiday lets.
As a rough guide: book six months or more ahead for summer holiday weeks, two to three months ahead for half terms and bank holidays, and anywhere from a few weeks to a couple of months ahead for a standard term-time week. If you're flexible on exact dates, you can comfortably push closer to the wire; if you're fixed on a specific week, particularly a school holiday one, earlier is always safer than later.
Noise and privacy tend to worry first-timers more than they need to. Units are generally spaced with a reasonable gap between them, and most parks are quieter in the evenings than people expect, particularly outside peak school holiday weeks.
A hotel stay suits a different kind of trip. If you want your meals cooked and cleared away without any thought, and you'd rather not do any washing up on holiday at all, that's a fair trade for a smaller room. Hotels also tend to sit centrally in towns and cities, so if your break is built around walking to restaurants, shops and evening entertainment on foot, that convenience counts for a lot.
See the details at seaside caravan breaks.