Chairlift
CommunityCommunity-sourced: based on player reports and not yet verified by this site.
The Chairlift is the ski-lift ride in Big Walk unlocked by completing the Green Tower. Riding it triggers the Big Sit achievement and leads to the island's highest point.
The Chairlift is a mountain ski-lift unlocked after the Green Tower is complete and its key is shaped. Simply riding the chairlift triggers the Big Sit achievement, making it one of the easier unlocks in the game. Riding the chairlift all the way to the top is also how you reach the island's highest point, which is tied to the Big Climb achievement. Exact lift locations and the path to the highest point are still being documented by this site.