For those that want a quick but fulfiling tour near Cape Town, I recommended visiting Kirstenbosch gardens. Very easy to uber to here from anywhere in Cape Town. I highly recommend joining one of their free guided tours - you just meet them at the start of the entrance, from Mondays to Fridays at 10h00, 11h00 and 14h00.. The guide is very knowledgeable and would introduce you to a variety of flowers and plants.
You can also join day tours to visit the Cape Point National Park, which I had to because I did not have the means to rent a car. The day tour takes a full day, but you have the chance to hike around the cape of good hope (which on a good day is very beautiful). The picture you see here there's the Greater Kudu and the ostrich. The day tour also includes seals and penguins seeing which makes the experience even better.