If you're not going to be riding off-road,I'd ditch the knobbies for street tires. Otherwise,replace anything worn out(chain,brake pads),get some lights,fenders,and a good lock,and ride the heck out of it.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line