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This NPS page is supposed to show all of the hiking trails in Acadia. It does, but only if you change the tile set in the menu in the upper right of the map to "Park Tiles Standard".
I thought they just didn't put the trails on the site and instead got a book from the library. Three days into our trip, I noticed that option. Might be a nice surprise in a video game, but it's a pretty wasteful secret on a national park web site.