Naka Meguro is probably most famous for its superb Sakura Viewing opportunity. A small river goes through this part of the city setting up a perfect scenery for the lantern lights and the white-pinkish Sakura flowers. Be careful however, the streets are quite narrow and everyone wants a piece of this perfection. My impression and more photos of the Sakura viewing in my diary post.
Meguro Sky Garden
The Meguro Sky Garden is a freely accessible garden area and directly located at a highway. If you wouldn’t actively looking for it you would probably not stumble upon it making it a little bit of a secret spot i guess. For more pictures go see this.