We went to Hurley Riverside last year. Very basic, but very lovely. Decent loos and showers - hot, though the cubicles were small. Well laid-out for people with small children. A small shop, IIRC, but no activities. Nice walk to the Thames, and along it to Marlow (?). Fascinating locks, as far as our then 4yo was concerned!
We more-or-less stuck with routine with our 4 & 2yos. They were so tired out that they fell asleep before they had a chance to object to being put to bed while other children were still up!
Our tent has zip-up 'bedrooms', so we made sure that the children's one was zipped upwards, beyond their reach, to keep them in it. Also, had a bag of toys ready to sling in with them when they woke, to give us a bit of a lie-in. Worked every morning!
Take wellies and waterproofs, but, if the weather's even vaguely warm enough, let them run around barefoot - even in the rain. Skin dries faster than shoes, and so you get less mud and muck brought into the tent itself. Besides, the children love it!