Punta Prima can be a pretty good spot if you get it on the right day. Generally it needs winds with a reasonable amount of east in them, although it can also work on a southwesterly. Straight northerlies are too offshore and gusty, but strong Gregal (NE) can bring in decent waves and permit down-the-line riding conditions.The water is always clean and transparent which makes it a really nice place to sail.
From Mahon take the Sant Lluis road and follow the signs to Punta Prima when you reach the roundabout as you leave the village.
Launching and landing can be a bit difficult as the wind inshore is often gusty and the launch zone is rocky. On the plus side the rocks are quite smooth and rounded!