visa for cruise arriving at Ko Samoi for the day . Do I need a visa for a day trip and then back to the boat.

Dear sir/madam, 

Thanks for your question, 

We would like to inform that you need visa to enter VN.

You can reference this link to check the ports which you are  allowed to enter with E-visa.

https://www.vietnam-evisa.org/vietnam-e-visa.html

In case, the port which you wnat to enter that don't have in the list of government. you must apply directly with Vietnam embassy in near your living country.

Thanks and best regards, 

Camellia Pham (ms.)