Посоветуйте как без экскурсии до mnemba island добраться ?

Вплавь, но сам остров закрыт для посетителей.

The island itself is privately owned and can be visited only as a guest at a price of US$1155 to US$1600 per person per night (2015 rates). As Mnemba is a private island, non-guests are not permitted to land on the island. [1][2][3] The island has a 200-meter exclusion zone around the island within which non-guests are not permitted. [4].