I avoid...
... people, which includes (ex)friends, family friends and imediate & extended family. And obviously strangers.
... reading and sending/replying to emails/PMs/forum posts.
... public places, especially restrooms or large open places with lots of people, like shopping centres.
... public transport, especially buses.
... school, university, jobs.
... calling or answering telephone calls.
... relationships, romantic or otherwise.
... dealing with relationship issues.
... painful memories.
... anything that reminds me of the past, like smells or sounds.
There's probably more, but those are the main ones.