Guess we do need to buy some red towels. We will be in town early on the sixteenth. Hope you two can welcome us.
There is a shuttle from the airport to the hotel and how do they know when to pick us up for the party
No hotel shuttle, (I do not think any in Cancun have their own) you need to schedule your own, here is the easy way. http://www.cancuncare.com/Cancun_Airport/cancun_airport_transfer. You do not want to run the gauntlet of cabs/vans at the airport unprepared trying to con you into their ride