Congrats Kaitlyn!!
I hope you are having Juan Carlos as your WC, he is super professional.!
Puerto Morelos, where is located your resort, has a big big reef, and the dept of this is almost 50cm or 2 feet to 6 feet 2 meters. yes you need to reach the reef by boat that you can take in the town, that is 20 minutes by bike.
Snorkeling would be great as an activity for your guests.
good luck!
Gonzalo