Kirstenbosch is best done without a clock. Take the Dell path from the main entrance, follow it up through the protea garden, and you’ll reach the Boomslang canopy walkway in about twenty minutes. From there, head left towards the cycad amphitheatre, not right towards the tearoom.
The Boomslang gives you a view across the Cape Flats on clear days that most people never see because they walk the main gravel path below. Sunset concerts happen on Sunday evenings throughout summer.