Grandpa’s Grove is a secret location west of Grandpa’s Farm that is unlocked by completing all of the Grandpa’s Shed related quests. Upon doing so, Clint will offer to clear a thicket near the shed in exchange for 30 gold bars. Once the player accepts, they will have access to Grandpa’s Grove where they will find a hot spring surrounded by six hardwood trees. The hot spring in Grandpa’s Grove provides the same regenerative effect as the Spa, including restoring health and energy, increasing strength, and reducing fatigue.
The player can return to the pond during the day to refresh the timer on that day’s buff, but will only receive a different buff the following morning.