I got an excellant deal on a room for 4 people at Pontins Camber Sands Holiday Park for 7 nights for only £119 through Groupon. I wasn't sure what it would be like but for that amount, I didn't really care.
The room we had was like a dorm room with two twin beds in the bedroom, a futon that folded into a double bed, small kitchen and a bathroom. Perfect for what we needed for the week.
The beach was only a 10 minute walk and I bought a trailer to haul our things back and forth.
As it is in COVID times, we didn't really experience all the amenities that the park had but there were playgrounds, a pool, bouncing castles, arcades and more. But for our trip, we just kept to ourselves and took day trips.