Puerto Banus
Puerto Banus is just south of Marbella. Saving some time and energy for a quick drink stop in millionaires paradise to see how "the other half live" is a must. Just take a look at some of the ocean going yachts and flash cars – another world indeed…
Estepona
Estepona has a larger and very different Marina than Puerto de la Duquesa. The quayside market on a Sunday morning is very pleasant and you can get some good bargains – don't be frightened to barter with the stall holders as they tend to overprice some of the items to allow for this – you'll get a better price.
If you walk towards to old town you will come across the promenade and lovely sandy beach, with plenty of beachfront cafés and bars.
The old town is well worth a visit but more beneficial during the week as many things are closed on Saturday afternoons and Sundays, after all – you are in Spain now…