We were on the Mariner in March and really, really liked it. We will definitely go again.
There is ice cream at the pool areas. It is kind of tucked in by the doors.
If you want fruit, just go to Windjammers buffet and get all that you want.
There is also an adult pool area that is for those 16 and older.
I liked that fact that there were four hot tubs in the pool area--all good sized--as well as plenty of deck chairs. Didn't seem to see as much "chair saving" as we did on
dcl.
My ds loved the tween area and activities plus the all night cafe that he and his friends could go to late night.
We did not book any excursions until we got on board and had no trouble. There were so many excursions that you could find something at every port. If you really, really want to do something, I would recommend booking, but we played it day by day and were not disappointed. Grand Cayman is the only one that I feel has limited excursions available. That will probably be a beach day for us next time.
Highly recommend rccl. Our neighbors have gone on rccl a lot--usually radiance class--and this was their first voyager class trip. They like both, though said the mariner offers more sports wise-ice rink, inline skating, rock wall, etc--and is definitely a bigger ship with lots of activities to do.
We had about 3500 on our ship (think capacity is 3800), but it didn't feel like it. The ship is so big and with so much to do, it doesn't seem crowded. I believe their newest ship will hold about 4300. Can't wait to go on it.