Family are coming over from the UK in April and will have about 3 days in Cairns in the middle of the month. Not the ideal time of year I know, so would be very grateful for advice as to what's worth doing (and avoiding!) at this time of year. Snorkelling on the reef, and a Daintree trip would be top of their list if possible. Will be staying in a hotel in Cairns, not at one of the beach resorts.