I have done all the puzzles, I have 90 people and the golden child. I went into the cave and read the letter so... is that where it ends or what? My people are still going strong fishing, eating, swimming, etc etc. Do I have to unistall the game to stop it because if I click quit, it still plays on.

Virtual Villagers, like all of our real-time games, is designed to be open-ended. Each game has clear goals, but the games can continue to go on and allow you to play as long as you like. The Island Events will continue to happen, which can dramatically change the way things are going for your villagers. Once you get tired of your current game, you can do like most people do and play the game again on different difficulty settings and/or try different strategies. You can also start another game in a different player slot. Every game is different, and the villagers are different, too. A lot of people even set new challenges for themselves, like finishing all of the puzzles (except the graveyard) without having any villagers die.

If you want to completely quit playing a game without uninstalling Virtual Villagers, you can either pause the game to preserve it for the future, or you can delete it from the Change Player menu.