Hi there @Williamina0, congrats on your first guests! It's an adventure. (Love your place - one day when i come back to Ontario, I'd love to visit!)
Firstly, don't panic.
You will learn lots as you host guests on how to improve your listing and your house rules as you go along. But what's critical is that you get a great first few reviews - getting a bad one first off is not good, so live and learn. As long as they don't trash the place, give them a great review (assuming their guest profile was over 4.6 - did you look at that when you accepted the guest?) and don't say anything about what you are unhappy about until AFTER they have done their review (if you feel you really have to say something). Put a welcoming face on until they have done their review. They know you are new as well, so ask them kindly for a review.
So here's the thing I have learnt after 8 years of hosting, instead of putting in lots of rules, find other ways to stop them doing things.
1. Do you provide laundry facilities so that they can wash towels themselves? If not, you will need to provide some spare towels. Things happen. It doesn't cost you much if you are washing the towels yourself as opposed to laundromat
2. Waterfall - is it yours? You can't stop them. It's at their own risk otherwise. Maybe in your listing you state the waterfall isn't safe (is that the reason?) and say BYO towels. I ask my guests to BYO tools for my pool, its fine. (because every towel costs me as they are laundered)
3. Driving on lawn. Had same problem myself in my first few bookings - put down some large rocks or mini rope fence, that looks like nice landscaping and stops the car. Problem solved. No rule involved.
4. Extra people. Do you price per cabin or per person? Sometimes that forces a weird behaviour with people but more importantly, in your listing rules, just say, max 4 people due to council by-laws/rules etc. Then if you know the break them, you can penalise in rating for violating house rules. You probably can't say anything for this set of guests as you want the review, but if they give you a bad review, you can always publicly state they had extra people so future guests know there was some issues.
Hang in there, it's all good! Enjoy being in the hosting business!
Kind regs
Mary