We enjoyed our day trips from Cape Town, too. We liked the old town of Stellenbosch, which is the largest town in the wine-growing area north of Cape Town. it's a well-established place that the Dutch settled in the late 17th century.
There are several blocks of up-market shops, galleries and small offices, with a very leafy walkable streetscape. It is one of those places in South Africa that is definitely not integrated. We only purchased 1 bottle of Chardonnay and 1 bottle of Syrah.