This is a real hidden gem in Belmont. There is a parking lot, as others have described, but I typically enter through the residential area, on Somerset. I was walking around that nice neighborhood (the flat, new part of Belmont) and discovered the trails by accident. A great review below spells out all of the trails for you.
The Good:
Beautiful, scenic, low-trafficked trails, very convenient for Belmont residents to enjoy nature right in their backyards (the trails do back up to people's homes). The trails go a good distance, about a 4 mile loop, which is a nice walk. There are steep parts but not too bad. It's not completely flat, but not very strenuous either (even for the elderly). The trails connect to Water Dog Lake, and while Water Dog can be fairly crowded on the weekends, it's pretty empty on these trails all the time. And, unlike Water Dog, you probably won't see any kids.
The Bad:
My dog has come home with 2 ticks. He's very short-haired, so if you have a longer haired dog, it's probably not a great idea. Some parts of the trails are extremely narrow such that you have to walk single file. While you hardly see other hikers here, there are a good amount of bikers. It's harder to move aside in certain very narrow parts, especially when you have a dog on a leash, but not a big deal if you're not hiking with dogs. read more