customary tips

[Rustywreck]

A friend and I will be going on a hog hunt soon. Lodging and meals are included in the package. The hunt is not fully guided, by that I mean we'll be driven to the stands, but on our own from there.
Additional services included field dressing and cold storage of the meat while we are there.
I don't have much experience with these kinds of hunts, so what is an appropriate tip? We hunted the same place last year and they treated us well. I don't remember what we tipped last year, as it was something we didn't think about until it was time to leave.
Neither of us are cheap, but we're not made of money either the three day/three night hunt will cost each of us $850.00.
I appreciate any advice.