We will be there also on a Viking Sun ocean cruise ship. Are you on the same ship. Thanks

not necessary just make sure you use insect repellant in South America. There are definite zones if you google them that are high risk and take precautions if you are going there. It does not hurt to get vaccinated if you are a world traveler and also before you reach 55 as many cannot be given after this age without a lot of health risks as many are live viruses.

Cruise ships anchor off shore and use tenders to ferry passengers ashore. Like any tender port, getting ashore is never guaranteed. Even moderate swells can prevent tendering and the odds of getting ashore are probably less than 50%. Ile Royale is the primary location. There are no guide services on the island, though trails are clearly marked and self guided walks are fine. I haver no info on approaching from the mainland.

We rented one from Redbox and it was not the original.

You have to enter by tender. A short ended ride only a few minutes. The ships do offer tours but you don't need one. You can easily walk around the island and get all the info you need from the museum. It's a lovel and easy walk. Enjoy

Of course you can tour on your own. I did not see any organized tours. even maps are sketchy. Your ship will use a tender to get you to the pier.

There is a daily boat trip from Kourou. Starts about at 8 am and leaves around 5 pm. Very nice trip

Seabourn Sojurn made a one-time crossing of the South Atlantic traveling first down the east coast of South America. I do not think it will be repeated