Ask how far the park actually is from the beach or the coast, in minutes rather than vague terms like "nearby". A ten-minute drive and a forty-minute drive are both sometimes described the same way in marketing copy, so it's worth checking a map or asking directly if walking to the coast matters to your plans.
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Footwear deserves more thought than it usually gets. Bring proper walking shoes or trainers for dunes, coastal paths and pebble beaches, sandals for round the caravan and the pool if your park has one, and something you don't mind getting wet for rockpooling or a paddle. Flip-flops alone rarely survive a full week of coastal walking.
Ask about on-site facilities' actual opening hours and whether anything's seasonal. A pool that's only open during summer months,
https://www.tripadvisor.com/Hotel_Review-g528807-d17635106-Reviews-South_Shore_Holiday_Village-Bridlington_East_Riding_of_Yorkshire_England.html or a clubhouse with restricted evening hours outside peak season, changes what a break looks like considerably if you're travelling in spring or autumn.
The short version: book peak weeks as soon as you know your dates, and treat everything else as considerably more flexible.
Take these four in order, location, size, facilities, pet policy, and most first-time bookings come together quickly. Our own parks sit across a mix of coastal and quieter countryside settings, so whichever mood you're after for your break, there's usually a fit somewhere in the range.