[quote=SD Realtor]Rich definitely go for it. PQ trail is a nice place to start. There are two entry points, one near Black Mountain Canyon park near the horse stables and another down at the bottom of the canyon kind of near the base of Qualcomm Hill.[/quote]There is another entry point on PQ trail, located across from Creekside Elementary. You can also get at the trail near the sewage treatment plant across from I-15. The trail passes under I-15. There is at least one other entry point to the east of Creekside, but I haven’t had the opportunity to explore it yet. I tend to do a run from Sorrento Valley PQ parking lot, up to Creekside and then back when I need to burn some energy.

GPS(s):
Entry off of Vista Sorrento = 32.904863,-117.22311 (runs north side of PQ).
Sorrento Valley PQ parking lot = 32.906587,-117.206624 (south side of PQ).
Black Mtn Road parking lot = 32.939018,-117.129649
Near Sewage Treatment plant = 32.943754,-117.107605 – don’t know how the parking arrangement along Cara Way.
Creekside Elementary location = 32.945273,-117.075999

It is also possible to drop into Penasquitos from Camino Ruiz park, but I would not recommend it until you get fairly good at balancing the bike – going down, you are often nose-down, hard on the brakes, followed by trail turning sharply and briefly climbing a short distance than more down. I also recommend a helmet if you take this path – Low branches. Respect people coming up the trail. Biking up the trail is a bit, um, interesting.

May be able to enter it at Sunwood Trail..
May also be able to enter at the back of one of the large buildings parking lot off of Scripps Summit.