Secret Woods
The Secret Woods are an area available after obtaining the Steel Axe.
To get there you have to destroy a large log a few meters above the Wizard's Tower, directly to the west of where the Traveling Merchant appears. You will encounter low-level slimes, a small pond that contains the Woodskip fish, reharvestable Hardwood, and season-dependant unique forageable items such as Fiddlehead Ferns, Red Cap Mushrooms, and Chanterelles.
There is a Stone Statue in the ruins. Give the statue a Sweet Gem Berry from a Rare Seed to obtain a Stardrop.