One word of caution about carrying too much in the way of provisions: bears.

If I am not mistaken, all the campgrounds in the park have some sort of system for cyclists to store their supplies in a bear-safe area. One place I camped there was a caching system, and another place had bear lockers.

First, don't forget to bring a lock or two with you - a padlock, not a bicycle lock - for the bear lockers.

Second, if you have a lot of stuff, and try to use the caching system, you could be sending up a half dozen bags ... because bags of food, soap, sunscreen, and anything remotely scented, are heavy and not exactly easy to haul to the top of those things. Also, depending on the time of year, they could already be full. The same goes for the lockers. In late August, Rowan and I were the only cycling campers in the place, so we had our choice of about a dozen fairly large lockers, but if it were July, there's a chance the lockers could be full, or maybe you'd only have one available to you. If you carry too much stuff, you might not fit it all in.

And the rangers and campground personnel will come around and check to make sure you've put your stuff away, and to remind you (about 100 times) to do so. But that's good ... better safe than sorry.