search lake travis. we've beat this to death several times (don't mean to be rude - it'd just be quicker for you to get your ?'s answered this way).
short answer: where ever you book - do it fast. most likely lakeway hotel, mountain star and vintage villas are all booked up. these are the only 3 hotels near the water. search google. for lakeway, texas, vacation
etc... for prop. mgmt ext. houses/condo's on the water.