Locker rentals on Labadee?

Wondering what to do with personal items while doing the insane-looking zipline. Do they have locker rentals on Labadee? Thanks.

Yes, there are actually lockers next to the zipline check-in area. There is a small charge which is charged to your onboard account. I don’t remember the exact amount.

Wondering what to do with personal items while doing the insane-looking zipline.

If by 'insane-looking' you mean super thrilling, you might be disappointed. If by 'insane-looking' you mean super cool and super scenic, you are in for a treat. It is a good zip-line, but it is somewhat tame in terms of how fast you go and how wild it is. The selling point is being over the water and the great views you get on the way down.