Start with location. Decide whether you want to fall out of your door and onto a beach, or whether you'd rather have a quieter, greener setting with the coast a short drive away. Both suit a staycation well; it's really about what kind of days you want to have. If you like the idea of an early walk before breakfast and a paddle before lunch, a coastal park earns its keep. If you'd rather cycle quiet lanes or potter around a market town, a park a little further inland can work just as well, especially if the coast is only twenty or thirty minutes off.
Finally, don't assume last-minute means limited facilities. A short break booked at short notice still comes with full access to whatever's on site, whether that's a pool, a clubhouse or coastal walking routes nearby. It simply means less choice over which specific unit you get, which for a quick, spontaneous trip is rarely the deciding factor anyway.
You can find out more via
Tingdene Holiday Parks UK.
For the caravan itself, most static units come with a cooker, fridge and basic kitchen equipment, but tea towels, washing-up liquid and bin bags are worth throwing in your bag rather than assuming they'll be there. A torch is genuinely useful for evening walks back from the clubhouse, and a few games or a pack of cards cover the odd wet afternoon without anyone reaching for a screen.
Coast and countryside both make for a good UK break, so the real question is what kind of days you want to have rather than which is objectively better.
Day trips are where staycation budgets often quietly slip, so it's worth planning a mix rather than assuming every day needs an admission ticket. A coastal walk, a free stretch of beach, or a wander round a market town costs nothing beyond fuel, and mixing these in with the odd paid attraction keeps the week varied without every day carrying a ticket price.