San Juan questions

Seeing as how I got into flyfishing after I left my ol' Arizona home, I
never had the pleasure of fishing the San Juan, although it was almost in my
backyard (we got big backyards out west) and a river I canoed quite
regularly. Two small questions, since I am almost definately gonna be back
in the USofA this summer and rw's picture page has me all charged up.
1) Where exactly is the stretch that gets fished, and are there more trout
downstream from there (OK, I know thats technically two questions....) For
example, are there trout as far downstream as Montezuma Creek, or Sand
Island?
2) What's the season? If I'm back in the summer, is it unreasonable to meet
up with some folks and fish it?

Thanks, and I ain't apologizing for nothing. ;-)
--riverman