Welcome back, Keelin!
SL can be a fun and interesting world with so many things to explore. Try using the Search in-world to find places to visit that match your interests. Look for groups too, and sign up to receive group notices so that you'll know if they host events. Hanging out at events is a great way to meet people and make new friends.
I'm mostly into roleplay myself (Old West), but there are many kinds of rp sims in SL to discover, if you might be interested in that sort of thing. And many of the rp sims hold OOC (out-of-character) events where you can also make some friends.
Good luck, and have fun!
Sam