We have been the 1st week of March for the last three years and are planning a 4th trip this year. This year we hit both water parks. The weather was quite warm. Last year (I think it was), we didn't do much swimming because the weather was chillier. We did make it to BB one day thought that year. The other year, we did lots of swimming but didn't take time for the water parks. It would have been warm enough several of those days. We love this time of year at WDW. It isn't really that busy until the Friday at the end of the week. They start gearing up for that 2nd week-end in March when the crowds usually do arrive so things (like the Downtown Disney boat from POR) are running more regularly and are open later.