Bantaeng and Bulukumba are two districts located on the south of Makassar. I visited both places a couple of days ago for business trip. The two places can be reached by public transport (using angkot and bus), but I'd say the most comfortable ways are to rent a car or take travel service.
If you're a solo traveller, travel service is the best option. There's a Makassar-based company called BMA that serves the route using air-conned minibus. The trip takes around 4 hours to Bantaeng and another 1 hour from Bantaeng to reach Bulukumba.
