When the powers that be decided to renovate the underused outdoor patio at Revolution Live and reinvent it as a permanent pool party, they went long on fun and short on pretension. They hired tiny, clean-cut, young barmaids; adopted the tagline "Grillin' and Chillin' "; built the center bar as a replica swimming pool; and narrowed the musical set list to highly singable mainstream anthems. Should you pop in at America's Backyard for happy hour (4:30 to 9 p.m. Friday only) straight after work, don't be too anal about your nice J. Crew outfit, because you are highly likely to get caught in the crossfire of the bartenders' water-balloon fight. Said bartenders (dressed like lifeguards, down to the board shorts or bikini tops and whistles) will make it up to you by passing out free drink tokens as freely as Halloween candy and by putting three or four straws in those giant, bucket-sized fruity cocktails. You know this is a place where things regularly veer out of control because they feel compelled to have a whole "Lost & Found" page on their website. "Good morning!" it says, knowingly. "You had a lot of fun last night, huh? So what did you lose; cell phone, keys, a present, a friend, credit card, shoe, camera, boyfriend, your panties, your pride?"