The Lost World: Jurassic Park, also known as Jurassic Park: The Lost World, is a 1997 American science fiction action film directed by Steven Spielberg and the second of the Jurassic Park franchise.
Four years after the events of Jurassic Park, dinosaurs have secretly survived and been allowed to roam free on a deserted island. In the time between the two films, John Hammond loses control of his company, InGen, to his nephew, Peter Ludlow. Ludlow assembles a team to bring the animals back to the mainland to bring in revenue and restore the company. Hammond sees a chance to redeem himself for his past mistakes and sends an expedition led by Dr. Ian Malcolm to reach the island before InGen's team can get there. The two groups confront each other in the face of extreme danger and must team up for their own survival (Wikipedia).
These locations were already discovered by the filming locations website, The Worldwide Guide to Movie Locations, so pay them a visit. This site also discusses the other filming locations used as well filming locations for the first Jurassic Park movie which was mostly filmed in Hawaii.
You can view more SFV Filming Locations here.
When the T-Rex is transported to San Diego and eventually breaks free from its trap causing destruction and chaos to the city, the filming locations used were actually Granada Hills and Burbank.
The T-Rex first breaks free in suburban Granada Hills looking for water which he finds in a swimming pool located at 17917 Mayerling Street which is in the Greyhawk Ranch estates.
The T-Rex then continues hunting in the Burbank Golden Mall on San Fernando Road in between Palm Grove and Orange Grove. Some recognizable stores include Starbucks, Crown Books, Blocubuster Video, and Fuddruckers. Speaking of the Golden Mall, you can view vintage postcards here.
The T-Rex heads back to Granada Hills at the 76 Gas Station known today at Granada Hills 76 located at 17000 Rinaldi Street. This location is the infamous scene where the 76 ball rolls down the gas station and onto the street.
And the movie trailer: