For the next heart follow the same path around the tree that you did for the first heart.  Instead of climbing up the side, though, continue past the climbing wall and then hop on either of the elevator platforms.

From here the path is obvious.  Just follow it all the way to the end.  You'll need to watch for Grimkins along the way.  When you reach the part of the path with the rocks that come periodically bouncing down the path, stick to the far left side of the path and you'll get safely past them.