we were there in early october (meant to be the wet season), but we had pretty good weather. It was usually nice and sunny in the morning, then we'd get the occasional storm in the afternoons.
I think the weather is hard to predict, but even if it's rainy you're still going to have a great time, cos it won't be cold or miserable.
Definitely go - you will have an awesome time!
I can't remember the price of the boat sets, but I'm pretty sure it was less than 2000 pesos. maybe 1500?