There is a bit of a cross over with what counts as Stellenbosch v Franschhoek so do check out the Franschhoek wine estates to visit also so you don't miss out on some incredible places, they're not far from Stellenbosch at all. Also see Paarl as again, not very far at all. 

For non wine related things to do in Stellenbosch check out the Stellenbosch page.