If choosing going to SW on the 4th or going to Blizzard Beach which will be really crowded, I would probably choose SW, but get there early and stay all day. Stadiums are huge and if you get there early enough can usually get in. If not do the things like feed the sea lions, go in the Penquin pavilaon, the manatees, the aquariums, gift shops, kiddy area, the underwater viewing, etc. There will be good fireworks that night. Then just find a spot to sit and chill after the show when everyone is in the mass exit stage. Let the parking lot empty out and then go to your car. So much less stressful to do that at SW since getting out of the parking lot is usually the biggest hassle you will have there on any given day. LOL We usually hit the bakery or ice cream shop and watch the crowd leave now.