At a restaurant I think a passive baby-themed activity -- something set up in a corner etc -- might work as an ice breaker but not tie up everyone's attention. At a recent friends' shower they had a bunch of books and pens set-up in a side room that had already been purchased for the baby (either from registry or by the parents) and asked folks to write a little message to the baby in their favorite book. Its was a nice.
My sense from the showers Ive attended is things are changing. Games are less common and men attending is more common and its often just a nice party with or without opening gifts.
I have a very traditional friend who plans to host my shower (shes been my rock through years of IVF). I do NOT want games but I think I will be able to be frank with her about it when we get closer to the time.

I hope if your aunt is engaged enough to host your shower you can tell her what you are thinking.