always best to go after July 1 st..rivers can be high and hard to cross.. I was there on the first week of June and we couldn't cross as the rivers were very high from snow melt, but saying that you can still proberly do box canyon run. been there about 14 times now, one of my favorite places...
there are some random camping spots right on the red deer river just west of mountain aire lodge about 3km...good camping ,great trails right there and you can fish the river...so many trails when i was there for 6 days i couldnt ride them all
the rally is on the long w-end in august...the rally is on the 5th .....sunday...great rally... nice course..lots of fun but can be tough for novice riders..but always lots of help around to get you out of a sticky situation...if i remember they do have 'chicken routes" too...haha
when i was in grande cache..we camped about 2 miles north from grande cache right under Mt Hammel...there are 2 spots just off the hiway...you cant miss them..you can then do the hammel ride to the top of the mountain and the caw ridge ride from there.i did see some areas south of grande cache...