are you talking about a hotel shuttle or a random one you catch at the airport. the main shuttle service is called cloud nine shuttles (there are some others too) and you catch it right in front of the airport. you just have to walk across the street from where the general pickup is. the airport itself is in downtown san diego and about 20 minutes from la jolla and the ucsd campus. so plan for at least that much time. what day are you interviewing? i'll be there next week