Even though you have signed purchase agreement and your loan request has been approved, you have no rights to the property, including access, until the legal title to the property is transferred to you and loan is closed.
Downtown Charlotte to Tega Cay or Fort Mill is approx 18.9 miles or 23 minutes drive time. If you live in Tega Cay or Fort Mill and work in south Charlotte near Westinghouse and Interstate 77 the distance is 8 miles and 11 minutes Drive time. Headed further south on Interstate 77 is Rock Hill South Carolina which is 6 miles and 8 minutes drive time from downtown Fort Mill.
There are also a lot of cool places close by, if not right in Charlotte. The mountains are about 90 minutes to the northwest, and the closest beaches are about 2 or 3 hours to the southeast.Charleston, Savannah, Myrtle Beach, Hilton Head, Asheville, and Boone are all 4 hours or less. was just there briefly to visit Carowinds, but my impression is Charlotte is a thriving if generic city, with somewhat of a crime problem (some of the freeways are pitch black at night because thieves steal the copper wire).