How can I enter to win the Lipton Discover America's National Parks Summer Sweepstakes trips? You can enter the sweepstakes on this web site - (www.lipton.com/summersweeps) to win a trip to Los Angeles, California starting June 1st . Your can return to the site in July to enter for a chance to win the Washington DC trip and in August to enter for a chance to win the San Francisco, California trip. Mark your calendar with a reminder to come back and enter each month. GO BACK