Yes, contact the resort to reserve your spot in their air-conditioned van.
You can do whichever works best for you. Feel free to search online to see if you can find a good deal. The name of the resort you are looking for is Villa del Palmar Loreto. Be sure you are looking at the resort in Loreto as there are other resorts with the same name in a different city.
No. You are free to come and go however you would like. Get real busy, or get real serious about relaxing. We will just have the renewal ceremony on the beach on Sunday the 12th at 4:00. Other than that, you can feel free to make any activity plans you would enjoy.