Hi there...
I got married at MP a couple of weeks ago and have to say that I loved the disco at the MP. We went there almost every night. Sure it was all the same music, really loud, etc, but as someone who doesn't dance all that often, being on vacation made everyone in our party cut loose and have a great time! I loved that it was right there and that we didn't have to take a 25 minute taxi ride up to the bars.
We did plan a shuttle through Elite Travel for one night into Cancun for a small group of girls (14 of us) and it was $59 one way. We actually ended up cancelling it at the last minute b/c several of us were super hungover from the night before, and the rest had plenty of cocktails with dinner and didn't know exactly how long we'd make it in the night, and didn't want to be so far from our resort...