Ted agrees to let Barney spice up his love life, so he ends up on an adventure of flying to Philadelphia, encountering the law and visiting the Liberty Bell.
Walden dates an attractive 22-year-old (Hilary Duff), but ends up being more interested in her grandmother (Marilu Henner); Jake and Alan go on a trip.
Luann enters the final stretch of her cabaret tour, while Dorinda tries to find her footing in Palm Beach; Sonja and Kelly put their clash behind them; meanwhile, a spa day goes awry when Sonja brings up some unfinished business with Dorinda.