We did this in may 2012. The ferry ride over is not what I imagined (a boat that holds 10 cars and 50 people with 30 cars, two buses and 300 people "really officer, we have no idea why it sank). The boat comes right into the port, and several
dcl exclusions board it. There is seating for everyone. It was quite nice actually. The boat ride was only about 30 minutes - and fortunately for us the water was calm.
We had a blast at xplor park. The zip lines are great. There are two circuits, we did them both. (Back to back or you will waste a lot of time in the equipment line)
Both are very good. If you plan to do both, start with the one that has shorter line. Some zip lines land in water, and there is at least one water slide in one (or both) circuits. Don't wear tennis shoes, wear sturdy sandals (ie teva) or water shoes.
There are also jeeps to drive. The path is above ground and under ground. This was kinda fun. My 21yo drove and was a typical kid. We had a couple of issues . Sometime he didn't slow down enough before entering the caves and we kinda got stuck, and the steering wasn't the best. But then again, it was due to inexperience, wanting to go fast and just being a kid.
There are also two river adventures. One is a raft the other is a swim. We did the raft and wished we did the swim. The rafts are a little hard to control, the paddles are "boards" that you strap to your hands and off you go.
A decent buffet lunch is included as are lockers.
It is one of the more expensive excursions, but it is worth it. We were there when it was not that busy. If you are there in high season the lines would be much longer and you would have to decide on what to do (both zip line circuits) and what not to do (rafts / jeeps). I think we had to be heading to the bus by 3:00 so it's not a full day either.