If I get there before check in are there facilities were we can change into our swim suits? Also dress code for places to eat? Thanks

Yes there is. In the water park area there is locker rooms to change. And I dont think there was really a dress code due to everyone wearing some out there outfits!

Bathrooms on the main lobby floor

We got there before check in and they allowed us in our room at 2!!!

Yes there are ample places to change and casual for eating. Just go and have fun you will not regret it! :-)