In San Diego - there is the Hotel Del Coronado - part of it was wired by Thomas Edison! I believe it was where the original Wizard of Oz was written. And the beach there is beautiful!
I love the SD Zoo, it is world famous, and it lives up to that description. There is also Seaworld - very touristy, I enjoy it. But many do not. There is Scripps aquarium too - haven't been there in many years. And here in Chula Vista we have the Nature Interpretive Center - it's part of the City Parks and Recreation Department.
Can't believe they wouldn't all be thrilled with a trip to Rosie's Calico Quilt shop - she has over 10,000 bolts of fabric, so maybe they would be over whelmed.