We did the same thing last year between the two hotels. The bus was really easy to use.. It moves really really fast. The return after the Boobs Cruise was uneventful and we were back ready to enjoy the resort without delay. Good luck. Have Fun.
Temptations Going to the area at least two times a year. Have stayed at both properties. No need for cab just a waste of money unless hauling luggage. Bus cheap just tell the driver tip him a couple of dollars he will take care of you. We bus it everywhere even to playa real cheap and dependable.
We have to stick with cabs because our first trip to cancun I got motion sick because the busses stop and go really fast very often. So if any tendencies to motion sickness the bus is a risk.