Input: concept: San Diego  answers:  ['Hotel del Coronado', 'Cabrillo National Monument', 'San Diego Zoo Safari Park', 'San Diego Zoo', 'Mission San Diego de Alcalá', 'Old Town San Diego State Historic Park', 'Balboa Park', 'Birch Aquarium', 'Old Point Loma Lighthouse', 'USS Midway']
Output: 

 what are the best things to do in san diego?