Check with your state for differing requirements but federal requirements for LSVs can be found here:
http://www.nhtsa.gov/cars/rules/rulings/lsv/lsv.html
Looks like headlamps, stop lamps, turn signal lamps, taillamps, reflex reflectors, parking brakes, rearview mirrors, windshields, seat belts, and vehicle identification numbers are what you are going to need.
If you live in a community where golf carts are commonly driven you might want to check with your city government. I know in Galveston (close to me) you can get a permit for a golf cart and drive it on the street without having all of the stuff listed above.