I would like to put in an official request for Rare to add instanced adventures to Sea of Thieves.
Imagine if you are sailing on the sea with a crew that you feel confident the crew is good, and you all decide to head on down to Dagger Tooth Outpost to pick up a Quest from a Pirate who has appeared on the island who has parchments pinned up to the side of the clothing shop and is constantly trying to decipher the riddles that all point to 3 different entry points to an instanced adventure.
You and your crew approach the crazed Pirate and he explains to you that he has all of these 'riddles' and he will let you in on what he knows about treasures buried deep in a cave that is believed to go deeper than the ocean bed itself for 100,000 coins. All the players in your crew enter in the amount of coin they can spare (allowing diverse amounts to be given from each player) to get the riddles, and map and he gives you the map (offering 3 locations on the map) where you can enter the instance where the riddles will become clear.
You and your crew gather up resources, and head towards one of the locations. Upon entering the location with the 'quest' in hand you and your crew are loaded off the map and into your own player instance.
As you login your ship sails into a cave, and in the cave are sparkling fish that you've never seen in the game before. There is something unique about this cave. You all choose the items you will take off the ship and head on into the cave where the ladder leads downward.
In the instance you fight several bosses each reaping its own rewards, and find several resources that are not 'typical' in the regular game that can be used to solve riddles and find secret passage ways. Several ways of using the environment to kill swarms of pirates, or skeletons (AI) are found in the caves, and you can get lost in this cave as its map does randomly generate to some degree.
This cave (instanced adventure) could take you 2 hours to complete. After defeating the main boss (3rd boss) an over arching story is revealed about Sea of Thieves, and other instanced adventures will come in developer seasonal updates.
You and your crew gain a 'randomized' horizontal progression item, but perhaps the randomized item is not what you seeked - now it's time to do it again with your crew until you are satisfied.
Lets say you and your crew all need a special coat, boot and glove set that will allow you to enter the far North side of the map where the waters become too cold to fall into, and ship battles here are far different than the ones on the main seas, and if you don't have the set you constantly take damage. Our instanced adventure lead to an open doorway into another part of the map that expands our adventure and way of playing.
Sea of Thieves needs Instanced Adventures like this, and more!

