Last summer my daughter and I did Vallarta Adventures' Outdoor Adventure zipline excursion in PV. That one was booked thru RCL but we're hoping
DCL offers it next spring so we can do it again. It was fantastic! Speedboat, truck ride, mule ride, ziplines, rappels, ziplines into water - one of the best excursions we've ever been on, and this from someone who is terrified of heights. I felt completely safe (and exhilarated!) the entire time. Unfortunately they won't take kids under 10, but for anyone with older kids I highly recommend it!
http://www.vallarta-adventures.com/tours/outdoor-adventure