Climbing Walls:

The OA Wall:
There is limited top-roping and bouldering at the OA wall in the stadium. More information is available at the website http://www.princeton.edu/~oa.

Rockville:
Rockville is the closest climbing gym to Princeton, located around 15 minutes away in Hamilton county. The gym has good top-roping, decent leading, a bouldering cave, and a campus board. Check them out at http://www.rockvilleclimbing.com/.

Elite Climbing:
Elite is the second closest gym to Princeton at around 40 minutes away in Maple Shade, NJ. This place offers significantly better bouldering than Rockville, though they have limited top-roping. Their website can be found at http://www.eliteclimbing.com/.

Doylestown Rock Gym:
Around 45 minutes away from Princeton and across the state line in Doylestown, Pennsylvania, is the Doylestown Rock Gym (DRG!) This place also offers significantly better bouldering than Rockville, with many cool different areas throughout the gym.  Although they have limited top-roping, they have some killer wall cracks. More information can be found at http://www.doylestownrockgym.com.

Go Vertical:
This gym offers arguably the best lead climbing in the area. They also have good top-roping and a small bouldering cave. It takes about 50 minutes to get there from Princeton. Visit them at http://www.govertical.com/.

Philadelphia Rock Gyms (PRG):
There are two Philadelphia Rock Gyms: PRG Oaks and PRG Valley (http://www.philarockgym.com/). Both gyms take between an hour and an hour and a half to get to from Princeton, with Valley being slightly further away. Both gyms offer superior bouldering and PRG Valley has an excellent lead wall.

The New Jersey Rock Gym:
The NJ Rock Gym (http://www.njrockgym.com) is around an hour and 15 minutes from Princeton. This gym has excellent bouldering and good leading and top-roping. 

Gravity Vault:
Flemington is the GV gym most frequent. I recommend it. Large boulder area, tall sport walls, many auto-belays, and frequent resetting. (http://www.gravityvault.com/)

Other Links:

 Our friends at the Harvard Mountaineering Club: http://www.harvardmountaineering.org

Route beta for destinations all around the globe: http://summitpost.org

Check the weather before you go!: http://www.gunks.com

Join and get deals at Mountain Huts around the world: http://www.americanalpineclub.com

Helping to keep our crags open: http://www.accessfund.org

Brag about your new send or catch up on the latest gossip: http://8a.nu