Captains!
Free Gold Chests, Rum Barrels, and Piles of Lumber will appear around you and your friends' Havens once a day. You also get a new Sketch from your Tinker each day. There is a reward of 50 Rubies every time you play the game 5 days in a row, and you receive Rubies when you complete each of the tutorial tasks or earn Medals for Foul Deeds.
Be safe out there scourin' the seven seas, ye scallywags!