Los Angeles is located just 12 hours from Park City and is an easy drive on I-15. Being avid road trippers, we see 12 hours on the freeway as easy and convenient, and travel to Los Angeles to visit Sam's brother somewhat frequently. On this trip we spent lots of time at the beach and on the boardwalk and had a great day at Disneyland, though there were way too many strollers for our liking.
Living in a land-locked state really makes you appreciate the beach. Anytime we are in California we want to spend all of our time by the ocean.