wsvt can be seen from the ''washington st.'' trolley stop, so after navigating the trolley to the station finding it wont be hard at all. if youre staying near the convention center then the blue line will take you to wsvt(prob about 15-20 min trolley ride) and both the blue and the orange line can get you from downtown to memorial park(about 10-15 trolley rides).
orange line stop for memorial is 37th st.
blue line stop is harborside. to get to the park you'll need to find street directions, but the park is only a 5 min skate away from both trolley stops. if you want i can leave my number in a pm and give you street directions when you need them from the trolley stop but since youre coming for asr( whom with?) it shouldnt be hard to get directions.
http://www.typicalculture.com/articles/snatch/index.html - this place is pretty fun and easy to get to. just take the trolley (green line) to mission san diego and youll see a bridge about 100 yards from the trolley stop, its under that. you can also see the bridge from qualcom stadium.
downtown itself is riddled with fun little stops and hills to bomb. just skate around and you should see a lot of familiar spots. behind the convention center is this little spot(youve probably seen sk8mafia/sk858 skate it) thats good for a little sesh. heres a video of some kids skating it
i hope that helps