Looking for family travel from US west coast. Suggestions?

We're looking for a family vacation, 6 adults, 4 kids (ages 2-10) for June. We're looking for the most bang for our buck from the west coast in the US. Any suggestions on travel agencies that have good packages or reputable internet deals to research? We're open to most anything, but I want it to be safe for the kids. Probably no country that requires shots and such, until the youngest gets older. We were thinking about Hawaii, but it was almost $3000 just for flights after a casual search.

TLDR: Looking for inexpensive trip for 6 adults 4 kids from the West Coast of US.