Hi Bob,
That's good news about the Iberostar Tucan hotel.
Regarding the excursions; being a regular swimmer, I'm interested in snorkelling at either Hoi Chan or Cozumel Island. I don't think I'll do the full day at the Eco Park. There was also a mention in the original itinerary of swimming in 'Shark-Ray Alley' whilst in Caye Caulker (now San Pedro!!) which might be interesting!
Anyway, being as all excursions are bookable in resort, I don't think that I'll book anything before I go. On this occasion I'd rather take some extra dollars and see how things pan out.
The Crowne Plaza is about 6 miles from the Cambridge Hotel according to my information, so I'll probably see you on the morning of departure. I've not been to Gatwick for many years so I don't fancy trying to find my way in the evening around an area that I don't know well.
The holiday is fast approaching now; I'll be off to organise some currency early in the New Year.
All the best
Mike