The first was a zip line! I'm not good with heights but this was amazing! The instructors were very safety conscious and you have a training run before the real thing! I can only say that if you've been thinking about doing a zip line then do it on St Kitts.
The other excursion we did was to take a BOSS underwater scooter on St Thomas's! Safety was the big thing and the organisers were great at giving instruction on the dos and don'ts. The divers followed every inch of the way and the whole experience as great. We were in the first group and that meant that we had time to get in some snorkelling - something else I'd never done but always wanted to! All in all an excellent experience!