If you're in Garrett County, MD, or nearby, and looking for a whitewater rafting trip of any level, check out Precision Rafting Expeditions. We went on a float trip last year with them and an easy whitewater trip with them this year and couldn't have been happier with our experience - and theirs!
Every guide that we encountered was friendly, learning everyones' names including people in other rafts, and highly experienced and knowledgeable. I kept telling our guide this year that it was hard for me to see myself heading right for a big rock and trust that he wouldn't let me slam into it and yet, he never let me slam into a big rock. I'd call that a successful trip.