Fossil Springs is nice. What about the Haigler Creek area?
When you say "hike" are you looking for a maintained trail or do you just pull to the side of the road and hike?
As a side note, i have read in the paper and heard from others that there are quite a few "remote" pot farms out in that area. Ive been through that area for the last few years and never come upon one myself. So watch your surroundings when you and the mother are out an and anout. Goood thing for you, if you do stumble upon a pot farm, you have the mother in law as a bargining chip!