Is primitive camping allowed? And if so would they be fine with me chopping any dead trees on the ground for splitting into smaller logs.

No camping allowd in either end of the park

Oh well, better than nothing.

Camping is not listed in the things to do in Guana. It's great for a day trip. https://myfwc.com/recreation/lead/guana-river/things-to-do/

No, there is no camping there.

I dont think you can camp. Not positive tho.