New South Wales
The Sight Tokens themselves tell you how you access them.
In Escape from Inssmouth, the tokens typically say:
"An investigator in ROOM X may reveal the adjacent area."
This does indeed mean that any space within that room is a valid place to reveal that Sight Token.
The Rental Shack is its own room, so you cannot reveal Sight Tokens that are on the Rental Dock room, even though the Rental Dock completely surrounds the Rental Shack.
The definition of Room is:
RRG - Room wrote:
A room is a group of spaces separated from other rooms by walls,
doors, yellow borders, yellow impassable borders, or the edges of
-- Each room has a single name that refers to the spaces in the room
as a group.