If you like your steak and wine, Balthazar restaurant on the V&A Waterfront is the best I've ever had. Radisson Red Hotel in Cape Town V&A is decent. Stayed there a few times for work.
With 11 nights and flying into CT, I think I would focus on Cape and do something like.
2 nights in CT city bowl, waterfront or green point areas (visit Waterfront, Robben Island)
Then take flight to Gqeherba (PE) flysafair.co.za and get hire car (pref 4x4 e.g toyota fortuner - booked 1 way back to CT airport)
Go to game reserve in eastern cape for 2 nights e.g. Kariega.
The start journey back along garden route.
I would stop Plettenberg Bay for 2 nights, Kynsna for 1, Breed River Valley for 1 and ending up in Franshoek for 1 (La Petite Ferme would be my choice which I have not seen mentioned).
I would then spend 2 days back in CT but now in Newlands/Bishopcourt area and do the things that you want a car for Kirstenbosch Gardens, Simonstown/Boulders and Constantia (Constantia Glen is nice wine farm with good food and great views)
Returning with car back to airport to return home in time for Chelsea.
Camps Bay Area just outside Cape town, is great for restaurants and very scenic. We did a night in the vineyard and pairing etc. Drive down to Cape of good hope is worth it, Frans hook & Bolder for the Penguins and Baboons roaming the roads like Longleat on steroids .Good restaurant at 2 oceans meet on the tip of the Cape .Drove to St Francis Bay via Garden route, then up to Pumba safari lodge ,home via Port Elizbeth and Joberg.