What Katie said Both Welbedacht Cave and Spout Cave (Tafelberg) are great and the “Sundowner Deck” at Spout Cave is 5-star! Water can be an issue at Spout Cave, so carry extra from Welbedacht.
Another option is Uitkyk Pass to Sneeuberg Hut. From Sneeuberg hut you can go for day walks to the Maltese Cross and Sneeuberg Peak.
I would suggest getting the Slingsby Hiking Map set for the Cederberg (2 maps) which gives you a very detailed (50000:1 scale) overview of the whole of the Cederberg and all it’s trails.
Here’s a link to Google Earth maps of both those trails: https://drive.google.com/drive/folders/0By3JuhL9YnteNU8xamw5MHVxYW8?usp=sharing