The Sea Point promenade has a peculiar slanted barrier (wall) that helps to stop huge storm-time waves from breaking onto the promenade and flooding the beautifully kept grass that lines the walkway.
I'm reasonably tall so I'm able to see over the barrier to what's below - so this photo is for the benefit of those who can't see over the barrier. As you can see - all that you're missing out on at low tide is a large outcrop of rock! :)