I thought that island content was supposed to be completely seperate and not requiring DoH or DoL for the island. However if you get the island to rank 10 and complete the final mission as well as have everything upgraded to rank 3 and all the land marks posted you get the permit for the Water Odder Otter Fountain for the Land marks, however, it is locked behind expert crafts behind DoH outside of the Island. Correct me if I'm wrong but wasn't it stated that DoH and DoL was not required for all island content. If you don't have it the cost of the materials needed for the permit range from 12 million to 15 million gil pending the server.