Circumstances have aligned such that I will have time to do some dayhikes in the Grand Teton and Yellowstone areas in the last week of May (coming up soon!). This is a family situation so no overnights or 'serious' treks are possible.
I have Bill Schneider's "Hiking Grand Teton" and Don Pitcher's "Yellowstone & Grand Teton" books.
I expect we will want to hike more in Teton than Yellowstone but I need to have my bases covered.
1) Are the Nat Geo trail maps the best option? They are 1:63,360 for the 4 Yellowstone areas and down to 1:30-something- for Teton. I have seen the Nat Geo trail maps for my home area and they kinda suck. I have a strong landnav background and am used to making my own 1:24k or 1:25k maps on the computer for my home areas, but I don't have the basemaps (or GPS tracks) for out West. I also don't know yet where I'll hike. What's a good source for the best landnav data? Surely someone has uploaded the GPS tracks for the major trails.
2) What are the kind of conditions to expect at that time of year? Again, this won't be a serious trek up to the higher altitudes, but I realize things can get squirrelly fast out there. I am from the SouthEast so I am used to having it pretty easy regarding weather and altitude.