Backpacker Magazine’s Destinations tool (based on Trimble Outdoors) lets you find free detailed information on hiking and biking trails across the country. You can read descriptions, view photos, print out topo maps, download gpx waypoints, filter by hike/bike/run, and even post your own trips. The “quick search” can be a little janky, bringing up only Backpacker trips – use the zip code search for the best results.

Below is the topo and elevation profile for Old Rag Mountain – one of the best hikes on the east coast: