Can't beat Alaska and late august early September is the time to go, especially for the Kenai! Tourist season drops off and the trout/dolly varden fishing really picks up (not that it was ever slow). I spent a summer working at a fly fishing lodge and living on the banks of the Kenai in a tent. Great times. I will go back.
Catch these guys after work:
Home Sweet Home for the summer:
If you are young, just graduated school, or in-between jobs for the summer I really suggest looking into seasonal employment. You get paid to live and work somewhere beautiful with active like minded people who love to explore. Work hard play hard attitudes.