Is this excursion suited for someone in a wheelchair? Obviously I wont climb the dunns river, but would like to come with my family and watch.

No it is not suitable for a wheelchair, the access to the catamaran is not great, and would be difficult for anyone with walking difficulties, the catamaran is really crowded, and we had to negotiate another 2 to get on to ours. At Dunns River the jetty it quite rickety and leads straight on to the sand, hope this useful.