The port is unlocked at level 29 and costs 8,000 coins. You can view all of the information on the port, islands, and ships on the ships page.
Wow thank for the super sick advice Brendon90. tank you :) xx
Quote: How do we change our co ops?
Tap the red exit button in case you are in a co-op, then find a non-closed co-op you like and tap join.