Crimson Tides Pirates 1.7.10 (Look for 1.12 Version) Modpack 1.7.10

Caribbean Tides is a mod pack dedicated to bringing you the ideal pirate experience.

Then there are both Cuchaz and Archimedes Ships to allow you to build and command your own vessel, and Witchery to bring in some of the darker more occult aspects of pirate lore such as Voodoo and the like.