Here is my 2cents and I have guided hunting, fly fishing, backpacking, snowmobile, ski, rafting, kayak, and pry a few I forgot. Worked for others for 11 years (9 as a fly fish guide) then was a owner for 15 years. Many times the guides put in huge hours and kinda count on tips. 10% the price of the trip is the norm.
As far as if the owner is taking you out I would get a owner's tip (bottle of reasonable bourbon/scotch/vodka, book about history of the area, few real good steaks delivered sometime after you leave, gift cert to the steak house in town so he can take the wife out) or the like. If he is the owner take a look at something they could use (gloves, hat, beanie, or the like) and send them one. They will appreciate it and take it as gospel that guides will flat out (right or wrong) remember you BY the way you tip. Honestly its actually all we talk about when customers leave.. Many many or every single time if you every plan to come back I would tip like you will return and your next trip will reflect your previous expenditure. When I was guiding fly fishing trips flat out if a return group did not tip me the first time I was always busy or had another group the next time they showed up. Just works that way.
Now if you find out what type of single malt or some good steaks the owner likes and have it sent around the holiday with a nice note and pic (not of the animal you killed or fish you caught) but something from the trip that stood out otherwise. Well the next time you sign up for a trip you will get the "friend" treatment well beyond 80 bucks for some whiskey...
I hear that folks get frustrated at tipping i understand that but also guides get real tired of holding hands and dealing with unreal expectations of lazy or hard to deal with clients. Believe me return guests who tip well (again right or wrong) get the best guides and the best trips period.