So I've been experiencing the theme park scene with our annual passes every weekend for the last 4, and have some updates to share. Most of my stuff has been during the horrible Florida daylight hours, and the theme parks are absolutely brilliant at providing harsh shadows to deal with throughout the day. Nevertheless, I've been finding I use my 24-70mm as my primary weapon. This is completely in line with the recommendations from the forum. So as always, everyone's advice is spot on.
I have only found a couple of practical uses for the 70-200mm range. When my daughter rides the Carousel, and there are a couple areas in Epcot where you can stand across a bridge and the extra reach comes in handy.
As far as a bag to carry the gear (what this post originally started out as), I picked up a Thinktank Sling-o-Matic 10, and all I can say is that I love the bag. I hang it over the back of the stroller while we're walking the parks. I throw it over my shoulder when we go on a ride, and it sits nicely and easily on my lap. I am also able to keep the D5000 on my shoulder with my Cinch Strap and have the bag as well.
I don't think the Sling bag would be my choice if I had to keep it mounted on my back all day, and it was fully packed, but if you keep it light, it really isn't too bad. I walked around 6 hours with my SB-600, extra batteries, memory cards, white balance caps, and a prime lens in the bag and never had to switch shoulders. Worked like a champ.
Thanks for all the advice, putting it to use has been fun over the last month.