You can look around the island all you want. The "Underground Tunnel Tour" requires tickets.
(see related question)
you have to take the underground tour
Go get the tickts out of the large trash can
They are in the trash can by the tour guide.The trash can with the lid off
go in the underground tour
You have to get a job at the museum after you take the underground tour
A green beret is worn by the Tour Guide on the Underground Tour on Counterfeit Island.
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
You do not die on Counterfeit Island.
there is no mansion on counterfeit island
The tickets to the Underground Tour on Counterfeit Island are at the bottom of the round garbage can to the right of the entrance. Once you have them, you have to return them to their owner, who is at the Web Browser Cafe on main Street.
It is between the Underground Tour and the Police Station in Downtown.
In the bin near the tunnel entrance.