Annual visitors: 1.6 million.
Peak employment: 1,600.
Year opened: 1999.
Major project in the works: 250-room themed hotel.
San Diego Zoo and Safari Park
Annual visitors: 5 million.
Peak employment: 2,000.
Location: Balboa Park and Escondido area.
Year opened: 1915 and 1972.
Major project in the works: Panda Trek at main zoo; tiger habitat at Safari Park.
SeaWorld San Diego
Annual visitors: 4.2 million.
Peak employment: 3,800.
Location: Mission Bay area.
Year opened: 1964.
Major project in the works: Manta coaster ride with ray viewing aquarium.
Sources: AECOM, park operators.
As it rides a continuing recovery for the amusement park industry, Legoland California in Carlsbad is thinking big — and small...