My list of suggestions

[C Dog]

I. More user interaction
 1. Trading
This would require more in-game items/objects. These item/objects could include but would not be limited to.
     A.Weapon Customizations
       a. Barrels
       b. Hilts
       c. Blades
       d. Engravings
       e. Precious stone placement
        f. Gilding (To make gold externally)
     B. Character armor/defense system
       a. Alligator skin boots
       b. Crab-shell hats
       c. Eye-Patches
         - Ones that actually benefited you
     C. Ship customization
        a. Sail customization
        b. Figureheads
          - Angels
            . Offer more protection
          - Eagle
             . Offers more speed
          - Sea Monster
             . Offers more power
         c. Cannon Configuration
             . Ability to position crew cannons on ship through ship-wright
 2. More user-to-user skills
   A. Non-Aggressive skills
      a. Crafting
        Make things such as
        - Figureheads for ships
        - Weapon customizations
        - Some sort of protection equipment
       b. Ship building
        - Ships should be built, sold and purchased by players. Maybe sold through shipwright
       c. Gun Smithing
         - Ability to build/customize pistols, cannons and grenades for other players, and of course sell them

II. Better Guild System
 1. Guild Bank
   A. Donation system
       a. Players can donate money to bank
 2. Custom Guild islands
   A. Ability to purchase a guild island
       a. Only Guild members may visit
       b. Hold guild battles
   B. Customization
       a. Hire workers such as gunsmiths, shipwrights
       b. Place meeting halls, and other buildings
 3. Flagships
   A. Ability to purchase guild flagship
       a. May be purchased with guild money
       b. Has custom sails
       c. Requires at least 4 guild members to operate
 4. Messages
   A. Messages at log-in
       a. Officers and GM can set a custom message for guild members upon login.
III. New Locations
 1. Spittlefield Harbor, Jamaica
   Many of the islands, including port royal and cut throat isle come from a movie called Cuththroat Island, which was released in 1995.
   Spittlefield Harbor is one of the places they left out.

Thats all I have for now, tell me what you guys think