The San Francisco park where Kirk's crew lands their cloaked Klingon Bird-of-Prey after travelling back to 1986 in Star Trek IV: The Voyage Home.
Golden Gate Park is a large public park in San Francisco. In Star Trek IV: The Voyage Home the stolen Klingon ship renamed HMS Bounty arrives over the city in 1986 with its dilithium crystals almost exhausted, and Kirk has it set down in the park under cloak. Two refuse collectors working at night see the grass flatten and a hatch open in mid-air, and drive off in a hurry.
The invisible ship is the crew's base for the rest of their stay. Sulu lowers sheets of acrylic into its hold by helicopter to build the whale tank, and Kirk beams back there after dinner with Gillian Taylor.
Gillian later runs into the park looking for Kirk, collides with the unseen hull and is beamed aboard just before the ship leaves for Alaska to find the whales.