i was wondering what the availability of excursions is once you arrive in resort compared to the cost/convenience of booking them in advance on thomsonexcursions.com? we want to do ocean world, safari truck etc which add up to £300 alone for 2 adults, and there were a couple of others we looked at doing to. is it better to book in the hotel (RIU mambo) or get it done on line before we hop off? any opinions greatly appreciated...