As seen in the scene were Grant, Malcolm, Ellie, John and Gennero are having lunch in the V.I.P. Dining Room, on one of the slides in the back, you see a sign for 'Jurassic Tennis'.
Jurassic Tennis[]
In the Background is the Jurassic Tennis sign
Jurassic Tennis is more than likely set at the back of the Visitor Center. In the novel, Alan Grant inspects plans for the park that featured Tennis Courts, that were probably located by the pool of the Safari Lodge.