Only in this bit 'while most people were in the park'
We had a real heatwave on our last visit in 2012, I think it was about 38 or 39 degrees so we did the parks in the mornings, relaxed round the pool in the afternoon for a few hours then back into the parks in the evening. Lots of other guests had the same idea and the pool area was pretty busy but we still managed to get sunbeds. It made for a lovely holiday so I'll hope for similar weather for you, maybe just not quite so hot!