Bittersweet

Bittersweet (2020): Indie. Developed by Jacob Bryant. Available on PC (Microsoft Windows) and Mac.

A unique experience in which you are tasked with discovering the mystery behind a newborn island.

You happen to pass by a lake you've never seen before, and what you see baffles you: An island being born out of the lake itself. You go in to investigate it... and see a paddleboard already set up for you...