Exercising with language exchange partners

I have a question in regard is there any effective exercises you guys can suggest me to do with my exchange partner.

Sometimes I'm just not in the mood to speak about my personal life or some ordinary stuff, not only that I also caught myself not using the new words.

I was thinking to describing pictures, and answering some question like: what would you do if you won lottery.

I kindly ask you guys if you can share some experience on this subject as I'm very inexperienced(new) with the subject.

Thanks