I will be flying with Emirates for the first time in a few months. I will be flying from the US to Maldives and on the way home we have a 12 1/2 hour layover. I spoke to someone at Emirates and they said I do qualify for a hotel and we are booked at Capthorne. I have a couple of questions on how this works.

Where do I check in a Dubai airport to get to tell hotel? Is there a desk to go to?

I was told since I'm a US citizen that I don't need to apply for a Visa. Do I just go through immigration and will i get some type of visa paperwork?

We plan on going to the hotel and drop our bags and go do a 4 hour city tour. After the tour we plan on going back to the hotel and take a nap for a while before our long flight
Home. Is it a problem that we leave the hotel for a tour? Does the hotel care that we are not in the room for part of our layover?