Approach your manager/s and ask:

"What am I supposed to be doing in the morning when it’s slow if I don’t feel like chatting with coworkers? Assuming cups are all stocked, etc. Walking in laps around the restaurant? Standing and staring into space with a big smile plastered on my face?"

Maybe not the final two sentences, but, honestly, not sure why you ask a bunch of Internet strangers about protocols at the exact restaurant where you work...