Greetings Texas Princess from the Mayan Princess!
Your trip is what you make of it. The weather is usually good at that time of the year. It might get a little too hot some days, and its just short of the start of the rainy season. There is always plenty to do with the Barrier Reef at our footsteps. Sail trips with Jimmy, fishing trips with Harry from Oceanside, exploring days to other islands, relaxing at the split, plenty to do and not much to do if thats what you like.
Don't expect any shopping extravaganza if that is the kind of thing a Texas Princess likes to do, forget the rolex & jewellery, the fancy dress and rather bring the hiking boots, the fins & sarong, the wide brim straw hat, lots of sunscreen & maybe some repellent...
The water taxi is the cheapest way to get to the island at $7.50 usd and leaves the terminal at 9:00, 10:30am, 12:00 noon, 1:30pm, 3:00pm & 5:00pm.