Tewi: We're not very creative, so we rarely enjoy visualization/wonderlanding. Instead, most of our interaction is talking while imposing one of our systemmates nearby. We just talk about whatever's been on our mind, about plans, or often about what our systemmates would like to do when switched later.
Our system shares the body/our host's life (although we still consider it his overall), so switching could be considered our primary activity. So talking with our systemmates about what they might like to do sometime comes up a lot.
It probably doesn't sound terribly interesting - maybe we're just boring, or maybe this is just what year 13+ of being a system looks like. But anyways, what do you guys usually do? (edited)