Exploring church street, Tulbagh.
Church street is considered to have the largest number of Cape-Dutch, Edwardian and Victorian provincial heritage sites in one street in South Africa. It can certainly swallow up a good chunk of time if you decide to explore everything, and by the time you're done you won't have walked more than 5 minutes from where you started.
The first thing that surprised me on our recent trip was how close Tulbagh actually is to Cape Town. We drove out twice in two days, and it was an easy hour and a half to get there both times. I got lost on the way back and found myself in Stellenbosch, so I won't comment on the return trip! We had a lovely stay in Alfa Apartments, one of the best maintained self-catering venues I've stayed at in years (although we took the breakfast option and were fed like kings). This really makes for an easy weekend getaway.
Besides exploring the rich heritage of the town itself, there are a variety of things to do in the Witzenberg Valley. Mountain bikers will know that the Cape Epic finishes here, and there's also some great horse riding. At a more sedate pace, the area is growing in popularity with bird watchers, and offers good wine tasting.