I visited the island for the first time today in Animal Crossing: New Leaf. Later my sister (a resident in my town) went to the dock, but Kapp'n wasn't there. Are there restrictions on who may go to the island, or is it only one trip a day?
After paying off the first dues of the campsite to an upgraded constructed home, Isabelle will inform the player on the following day that the previous Mayor will want to present himself after a long retirement. Tortimer will address the PC Villager that he in-list your name on the roster for Kappn's boat ride.
There are also restrictions on who may come in from Wi-Fi, being only friends or those with your code added. This outlook changes once you become a pledged member of CLUB TORTIMER sold in-store at the island at times presented by the shop.
Each round about trip costs 1000 bells and consists of this single charge, allowing anyone from a Wi-Fi group to ride for free. Once one wants to travel back the requirements are all characters must go back to their seatings to deploy back to town.
You may only go to the island if you've paid off your 'mortgage' to Nook.
More information here.
Yes anyone can go to the island. The mayor of the town will be able to go after he or she has paid the mortgage of the house at least once. The other players have to do the same thing. Although it is different if you are in someone else's town. Even if you don't meet the requirements for your town as long as the other person who's town your in does reach the requirements then anyone that person invites will be able to visit the island with them. hope this helps!