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This mosque with a very beautiful and interesting architecture is included in the list of 30 most unique mosques in the world.

The long stretch of waterfront in the middle of the city. A very nice sunset view. Food stalls set up every night here. This is a hangout place. Do not expect an actual sandy beach.

An old fortress from Dutch colonial days. Free entrance (they will insist you sign a guestbook). You will be requested to give a small donation, but you do not need to (the money will go to the guards and not to the site). The entrance fee for the Museum (Museum La Galigo) is Rp5000 for Indonesians, Rp10,000 for foreigners (two buildings, but you just need to paid once).
If you are a foreigner, you will be the attraction for the locals there, some people may ask you to take photo with them. The friendly attitude makes this experience quite fun, and you can learn a lot about Sulawesi as well from it.

A small island about 20 minutes away by boat from central Makassar.

A beautiful white sandy island with good diving. Trip from Makassar takes 30-45 minutes, and costs Rp600,000-800,000 (1 boat can carry 2-8 people).