Our forecast was scattered showers each day of our trip also, and it did rain every day except one (unless it rained while we were napping), but only for a half hour or so mostly. We did have one evening that it rained hard for at least an hour, but it wasn't bad.
Buy a poncho (we did not, wished I would have), but a Mickey umbrella (wish I had one of those too, used my plain blue one), buy a hat (I did, lol) and have fun!!!!