Exploring St John's Island and its wild habitat - Singapore Holidays. This is a very undeveloped island compared to the main island of Singapore. It is good for those wishing to exploring 'jungle like' terrain without venturing too far. Make sure you bring your own water and food as you won't find them on the island. You can travel to St John's Island by taking a ferry from the Marina area south of Singapore (take the MRT - mass rapid transit trains)