Uh...we don't say "keen" here.
Try "Gnarly" or Awesome".
:-)
Also, with the OP's handle of Idaho Brad and coming from SLC....
never, ever say dang-it or gosh-darn it, and, since you'll inevitably encounter Massholes, learn the terms "wicked" and "hella".
And "Oh my heck!" will forever brand you a moron.