Honestly, we have no idea where your relationship is at this point–only the two of you do. We are getting bits and pieces in dribs and drabs, and I feel it’s kind of like trying to hit a bullseye on a dartboard with a blindfold on.
Although we all have the best of intentions, as you can see, opinions differ. I feel there really is no right or wrong answer–only what works best for you, your partner, and your situation. Things like this can strength a relationship as you build something together, or cause great resentment because someone feels they aren’t getting a fair deal.
As you spell things out further, it sounds like you have a very special place in a magical setting. It also sounds like you have more to take care of than the average Airbnb. Follow @konacoconutz 's sage advice about equipment, waivers, liability, insurance, etc…
The more I hear, the more I think you’d benefit from an attorney and some sort of impartial mediator who can help you hammer out an agreement that is a win-win for you both.