I bought my Body Glide at Dick's Sporting Goods for around $10 w/no shipping (ha).
I would add an extra pair of shoes, like sandals or flip flops, these you'll wear to the pool, down for a quick bite, on rest days etc. etc. I always recommend people take shoes other than their park walking shoes (which may also get too wet for comfort) so the pressure points are different or to relieve blisters. This year I'm foregoing the mister fan for just a pocket fan (in FL you don't need MORE humidity, you need to dry what's on you) my favorite is a $.99 Wal-mart version that fits in my shorts pocket and even comes with the batteries and really moves the air.
Another vote for "no-black" and "extra clothes for mid-day change"
Also, my favorite "new found" product is an all natural all-over body mineral salts spray that is made to neutralize body odor when you sweat. I've been using it for my feet when I go to the gym and LOVE it. I sprayed my kids down with it on top of their sunscreen during our July trip to the desert, I didn't want to smell them coming!