When does the forest FINALLY end

Try to add more candies with: add 10 candies. If that doesn't work, go into your savegame text file (after you click "Get the current game as text") and search gameCandiesCurrent=. In front of it there should be a number. Change that number to whatever you'd like, then copy all of the text and paste it into the loading part, and load the game.

From the Candy Box 2 Wiki: Easter Eggs

One Easter Egg in the game is that when candy count reaches 42, The Player ("\o/") appears beside the number for a brief period of time. This is a reference to the Hitchhiker's Guide to the Galaxy, where 42 is the answer to life, the universe and everything.

When you get 1337 candies, the counter says "You have leet candies" in place of the count of candies.