We did the tubing/zipline combination (Chukka Tours at Good Hope Plantation) and part of group did tubing only. The tubing-only tour is quite a bit longer than when you do it in combination and involves a safari bus to the put-in point. Zipline folks walk to put-in point. Lockers will easily hold a small backpack and a couple of pairs of shoes for $8. Water shoes required for tubing, closed-toe for ziplines. Ship security was verifying all tour participations actually got back on ship, so stay in your bubble until you do. Then vaxed can get off again to shop. The Chukka folks were really friendly. By the way, each activity tips separately, including lunch (which was great chicken and cornbread) if included on your tour. Nice small pool and slide area as well.