Is the parking lot big enough for our 24 foot motor home? Just for a day visit, not looking to camp.

yes

I agree - there is a very big parking lot. The road that takes you to the end of the loop where there is more hiking is one way. You should go to that trail (not sure what its called) because it has a wooden walkway over the swamps.

Yes. The parking lot can accommodate a 24ft motor home