From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon Park (Japanese: 野生ポケモンの森 Wild Pokémon Forest) is an attraction located on Tangelo Island. It made its only anime appearance in The Lost Lapras.
After being lulled to sleep by Jigglypuff, Ash and Misty's blimp crashed into Pokémon Park. At the time, they thought they may have been stranded on a deserted island. Misty then worried that they would have to eat bugs for the rest of their lives. Suddenly, a group of tourists appeared, causing Ash to wish that the island they were on really was deserted.
They soon learned, via a public address announcement, that Pokémon Park is an amusement park, and a very popular destination for tourists in the Orange Islands.