That is really sad because there are so many neat stores but not in the downtown area where I think you will be. Billi would know more details with the area. There is Cozy Quilt shop, Rosie's and QIAD. I myself would rent a car for a day and enjoy doing your own mini quilt hop. You can check the map of the local San Diego quilt shop hop :
http://www.cruisinquilters.com/html/stores.html