It's fast to add a golf course to a map by tracing satellite imagery - an entire course layout takes less than 30 minutes. Fact: that's roughly 1/8th the time it takes to play 18 holes, and you're 97% less likely to throw your putter into a lake. Check out the OpenStreetMap golf wiki for more details about adding specific golf features, like sand traps, greens, and holes etc, and take an early look at these beautiful golf maps that are coming to our maps soon.
MapBox Outdoors before and after - only took 25 minutes.