Hi!
I highly recommend a visit to the waterparks, they are among my favorite places to spend a day at WDW.
Blizzard Beach is a lot of fun, but one thing you should be aware of is that there is a lot less shade there than at TL. (Sunscreen is a must!
)
Definitely get there early! (Or much later in the afternoon, when the crowds have died down.) The first thing I always do, because I travel solo, is secure a shady spot to put my things. Then I go and get a locker, a mug for beverages, that sort of thing. But getting a good spot in the shade is my priority because there is so little of it.
My favorite spot may well work for you because it's very close to Tike's Peak (the play spot for young children), the bathrooms, places to eat and drink, Cross Country Creek, and the chairlift.
When you enter (and try to be up at the front of the line if it's first thing. They usually start letting people in about ten or fifteen minutes early, and hold them at the bridges until official opening.), hustle down the walkway towards Lottawatta Lodge and hang a right in the direction of the Towel and Locker booth. Just to the left of the towel and lockers place is a bridge. The bridge in the early morning is closed until official opening. A drink stand called the Cooling Hut is right there as well. Wait right there until they let everyone in, and then cross the bridge. The chairlift will be dead ahead. You'll want to bear right and go past Avalunch (and there's a Sno-Cones place there too). Head past the bridge leading to Tike's Peak and up ahead you'll see a big building containing the restroom facilities. Off to your right you'll see a nice wooden platform, surrounded by shady trees. It overlooks Cross Country Creek. There are chairs and loungers. That's usually where I stake my claim because, as I said, everything is nearby: bathrooms, food & drink, the chairlift, the creek, and, most important for you (probably), Tikes Peak.
There are maps of Blizzard Beach on line (not sure where, but I've seen them) and you can take a look at the layout if you like. I hope you have a great time at BB.
I'm just a freak for the waterparks...