I live near TAMU in College Station, Class of '95 as well. There are tons of sidewalks along roads that wind all over "West Campus". West Campus is the huge chunk of A&M that's west of the railroad tracks. "Main Campus" (East of the RR tracks) is ok, but space is tighter and can be tougher to navigate.
West Campus includes some great areas around Research Park and the George Bush library. You might do best to look at a map of West Campus and draw out a looping route of a few miles and just swing by your car for water each lap.
Fun fact - TAMU is a "Land Grant" University, where main campus was given/started as one square mile. So if you run the perimiter of Main Campus, it's almost exactly 4 miles. But you'll have quite a few streets to cross since it has lots of entrances and exits.
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