The greenway is 1 1/2 miles but you can extend your bike ride/run/walk since the path, with a short road segment, runs past the airport to Airport Pulling Road.
https://www.traillink.com/trail/gordon-river-greenway/
If you cover all paved/boardwalk areas it's about 2 miles, then there are at least 2 wilderness paths (sorry, don't know the length), but very nice.
There are several different ways to go. I think if you run straight end to end it is only like 1.5 miles.
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