My cousin and I hunted 53 2x in early September and killed both times.....I'll echo what most say about trailheads. I'll share the spots we went and met tons of friendly hunters.
Lost Lake Slough.....and should be renamed Lost Lake Zoo in September. We were back in there and bumping into weekend campers and hunters.
Horse Ranch Park.....same as above on BOTH sides of the road (which is 521) mega boot/horse/bike traffic.
FSR 709/12A south towards the West Elk Wilderness.....drove about 1/2 way up and turned around because it was like a Walmart parking lot......we then drove and hiked into a spot where we killed my 6-point which is where my feedback stops
My cousin killed his in '18 a mile from Horse Ranch Park. I'll share that b/c we will never go back there again it was so nuts. We got lucky after a mega downpour/rain day in 2018....pushed all the hunting pressure out, but we were persistent, mile from the truck when the rain let up 30 minutes before dark. 6 point came in on a string....like I said "lucky".
I've come to the conclusion that starting in at any sort of "parking" is a disaster and downright morale killer. I like to look for spots I want to get to, then find the closest parking spot. If it's even remotely close to a parking lot, we write it off. We will NOT write it off if its close to a road though.....we go where we think there will be elk and far from ANY parking.....which leaves the question, where are you parking? Sometimes miles from where we want to go in and the first spot we can squeeze in the truck.