The running club and I run this lake most Saturdays. The really nice thing about it is that you can divide up the larger (4.2 mile) and the smaller (3.1 mile) sections of the lake. You can combine them to make a run of just about any distance you want and you are never more than 2 miles away from your car, just in case.
We always park at the 168th street parking lot as this gives you the most flexiblilty for designing your runs.
The area is very nice, but there has been trouble with car break ins. You should not leave any valuables visible in your vehicle. I haven't heard of any recently, but there was a time there where they seemed to be happening quite often. Still it is a known issue and you should know about it.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.