Grab tickets and join the crowds at a game at Greenville Sports Park. If there's nothing scheduled while you're in the area, you might like to check if the stadium offers a tour of the grounds.
You'll be spoiled for sightseeing choice in Greenville. Greenville Sports Park is a great place to kick off here, but there are lots of other worthwhile spots to visit. Fletcher Warren Civic Center, Greenville Promenade, and Hunt County Fairgrounds are near the sporting facility and will top off your day nicely.