Ok so I had a long list of stuff depending on your priorities, posted it, and then forgot about the boat. Regardless of your playstyle you want the boat first for one reason: it can hold all of the iron from an entire swamp. You want this. You REALLY want this. Park it near your swamp of choice, set a portal, and then start filling it. When the entire swamp is clear and there's no more iron you can haul the entire batch home. Even if you want to build a ton, you'll probably only need to raid a couple swamps for your entire career with your character and using the longship is key unless you want to make a ton of trips.