Beach vacations: Hawaii, hands down. Love Oahu, love Kauai, love Maui, love the Big Island. I've been there six times so far, for my honeymoon, for vacations, and to visit a college friend who lives in Honolulu. One of these days, I want to take classes in Hawaiian culture and mythology at UH.
Also, I love beach camping in Southern California.
Nature - Grand Canyon is a must-do and a must-do-often. I'm hoping to hit more of the US National Parks in the future.
Also, Vancouver Island in British Columbia is amazing - and a nice change of weather from Los Angeles!