Wow! Lots of good suggestions.
Thinning I will do--not to prepare the place for horses but to get a few bucks as the timber has some value. I planted 1,300 trees 23 years ago and they are now ready for a commercial thinning.
I was considering since I would be thinning anyway, would there be an advantage to do anything to make it more appealing to horse people and the resounding answer from you guys is "no". That's good info, it makes the thinning simpler.
Everybody who visits loves this place. House is on the back corner, 1,200 ft. from the road so we have privacy. Privacy with a view of Mt. Hood, 11,000 ft. high and snow covered most of the year. And in Oregon the land use laws are so restrictive that acreage goes for a premium--the powers that be want everybody to live in a tiny condo stacked on top of one another, all downtown and ride a bike, walk or take public transit wherever they go. They think it is immoral to build a house on acreage. Getting on in years we need to be closer to town, which is the only reason we'll be selling in a couple years. We are spoiled & we expect to have a hard time finding a place we'll like.