My go to is TrailrunProject, HikingProject, and MTBProject. REI recently (a year ago, maybe more) took them over and they have a lot of great info on them. As the data is crowdsourced, you get the best info on current conditions, trailhead parking, and distance. Being able to download them for off-line use is also a huge plus. I use all three because sometimes the running one vs. the MTB one will have different trails in a given area. Good luck and have fun!