The park itself puts out a pretty good map of all the trails. It is available online:
A four weight is a good rod for the springtime. Delicate presentations for dries, as well as the backbone to throw heavier nymphs and streamers.
I've heard good things about the MSR "Hubba" series of tents, but have no personal experience.
Good luck on your trip planning. Surely by next spring we'll have some water for you to fish!