I'm sure you know this, but never leave anything on a stroller that you would miss if you came back and found it gone.....
I can't think of a single ride you can't bring your DSLR on. You can have them out on most of them (just be careful not to use the flash on dark rides) and the others (RnR, ToT, Kali River Rapids) have room for you to store your things. On RnR, I put my bag by my feet with the strap around my ankle. Also keep a zip loc bag with you to stow the camera on any wet rides.
Have fun! There have been some great ride shots posted here!