Relaxing at Chollas Lake: It's a little oasis with the sweetest wildlife perks. Walking from the parking lot toward the lake, one is likely to be enthusiastically greeted by pigeons and squirrels actually sitting side by side hoping for offerings of food. They are more likely to run towards you than away from you. And, it's an amazing experience to sit at the concrete table surrounded by very large birds who act as if you are one of them. Here you can forget that you're in the city, and forget your cares. Jog, walk, sit, or just enjoy the experience being a few incredible inches away from animals that don't mind you being there as long as you wish.
I live across the street from this park and just recently found out about the Trail Running section of it!
-First, there is a "paved" section, I put it in quotation marks because it is technically paved, but as another reviewer pointed out it is pretty uneven terrain, but it is all around the Lake so it is peaceful. At 0.8 miles the paved loop is good for walking, new runners, running with the peace of the water right next to you and, since the water is right next to you, for when it's super hot outside because the loop is cooled by the Lake.
-Second, there is the trail that is mapped on this site, this is about 0.6 miles of the paved path and then about 1.4 miles of trails with some good unevenness and a few good uphills. This area actually has a lot of smaller "goat trails" that zig zag back and forth across the canyon area, so if exact distance is less important to you and getting some good training in on tough terrain is your goal then they mix it up and make it much more difficult.
-Third, there is actually a long trail here which I refer to as the Rim Trail, because it follows the rim of the Canyon that this Park is in on the North side. I would put this trail at closer to 2.6 miles, it is unpaved, but relatively flat, it does have a HUGE uphill to begin and a HUGE downhill to finish so be aware of that. The best part of this section of the Trails is that you can stop and see all of Downtown San Diego, the entire Park, Coronado Bridge and the Pacific Ocean from way back in our suburb.
There is also a fitness type of trail with pullups, pushups, balance beams, steps, etc. I have not tried this yet but probably will this weekend.
Overall I feel exceptionally lucky to live where I live after finding this San Diego Trail Running gem!