Biscane national Park and everglades in August

I will be visiting miami from 2 Aug to 5 August and would like to anorkell in Biscayne national park and see the everglades. i want to know since it is monsoon at that time, is it possible that snorkel trips are cancelled? If yes, can we still see the park on boat? How much will a can cost from Miami to these two places for a day? are there alternate modes of transport (train or something)