What are the options for extending a tourist visa in Thailand, specifically regarding Samui?

Go to the tab topics in this group, then click on London online application.

There you can get advice in the posts.

The only issue could be the check-in staff at your airport of departure if you do not have proof of intention to leave Thailand within the 30 days granted by a visa-exempt entry. KLM and Emirates staff where I fly from (Glasgow) always ask, but I always have a visa.

So, if you don't have much visa history in Thailand, suggest visa exempt (30 days) with extention at Samui 1900thb (30 days). Need a couple of passport photos each and copies of passport. Get the form at immigration.

No actual need for tourist visa when staying 59 days only. You can just arrive without a visa and will receive an exemption stamp for 30 days at border or airport. (Assuming your British?)

Make sure you have a return flight when you board and extend your entry stamp at Immigration office at Samui before your first 30 days expire (1900TBH-50£).

With this you receive an extra 30 days.

Though if you change your mind and want to stay longer you can not and have to exit after 60 days in this case.

When you decide to get a tourist visa in England (valid for 60 days) then you can stretch it to 90 by extending it at Immigration (anywhere in Thailand)

What visa are you looking for. You can extend at Samui immigration.