Just got back from doing 3 nights at VB and 4 at WDW. We found it enough time - BUT - it's a big depends. For one, the weather is a big variable. There isn't much else to do at VB if it rains or gets cold. And it was quite cold while we were there - hardly sitting on the beach weather, so after a couple of days we had our fill. Also, it depends on your own level of enjoyment for the beach and pool. Personally, while I enjoy it for a while, I am not one who enjoys sitting in the sun for hours on end, and while the setting at VB is quite pretty, it's not one of the nicer beaches we've been to in terms of wide swaths of white sand. Very pretty scenically - but not the kind of place I would enjoy sitting around in for prolonged periods of time. Also, found the activities geared more toward younger children and there was not enough to do for our older kids. So I think it really depends how much quiet, down time you want before heading to Disney, which is much more active. I think if you added one more night, it might be just enough to get a true feel of the place. But in case you get stuck with bad weather, it won't be so long that you'll find yourself going stir crazy.