The closest mission to you is San Luis Rey, in Oceanside.
You can mapquest this directly from the resort. Our website has a 4-5 minute slideshow on this mission, the address and other relevant information. Other options would include visiting the San Antonio de Pala (sub-mission) about 30 miles further east of San Luis Rey, driving to Mission San Diego or heading north to San Juan Capistrano. Each have their attractions.