Although this basketball gym is located in the Couve, I shoot hoops here every other Tuesday evening. Basketball open gym starts at 8pm and lasts till 10pm. It is free to drop in. However, you'll have to sign in and fill out a waiver at the entrance. There are lockers available if you need to lock up your stuff.
Some days they have pickup games going on. Other days people just shoot around and practice their game. Some of the players that play regularly pickup games here are pretty good, so make sure you bring your "A" game if you get invited to play. All skill levels are welcome.
In case you get lost finding the O'Connell Sports Center, here's the map: