Rancho Bernardo Inn, San Diego, CA https://www.ranchobernardoinn.com/
My most important take-away after visiting this 287-room resort located 29 miles northeast of the San Diego airport? Every staff member we interacted with was super friendly and helpful… my compliments to the GM and the HR department. I will remember. :) Add in 80,000 square feet of meeting space, championship golf, a great Spa, beautiful gardens… and a whole bunch of other cool stuff and you should add it to your consideration set.
A zillion team building possibilities. One I liked (because I used to have this huge organic garden and now I live in a flat on Russian Hill in SF and miss having a garden and a dog) is when their chef takes your group out into his huge organic garden, helps your folks pick the freshest ingredients, and then take them back to create “something”… which can be a lot of different things depending upon the season, the size of your group and how much time you have.