Pretty much anything I would do with a romantic partner or a platonic lady friend. Had a picnic with one recently where we read funny, insightful, or poignant pieces of writing to each other. Went to a museum and played board games with another.
These outings were done as part of specially priced social/private packages. I get the attitude that social activities are superfluous and run counter to the point of seeing an SP, but even if sex was my ultimate focus (which it is not), I’ve observed a strong correlation between better sex and deeper connections with an SP - which platonic activities help to develop and strengthen - so it makes sense to do in that respect too.