When we rent in the middle of the school holidays - it is deserted and no one turns up until after 11 - then they all clear off again by 5 - or 6.
Best days are a quick 10 minute rain shower at 12.30 - we pop back in doors - everyone goes home -- then we pop back out again!
Even at the busiest time (weekends) all you need to do is walk a few hundred yards from the car park to (people are so lazy!) for some proper space.