Attending my first Buddhist Retreat

This weekend I will be attending my first retreat with Zen monks. It is at a camp ground and I will be camping in a tent for the weekend. Does anyone have any advice on attending a retreat for the first time? Is there anything I should expect, or bring that I might not think of? Any advice or experiences with retreats and facing monks for the first time will be appreciated. May you be happy. Bowing to you.