It is to the far right of the island past Toupee Terrace. It is guarded by lasers, so it will be the last stage of beating the island. You must first rescue the three missing spies (in order), the third one giving you the Ultra Vision Goggles to see the lasers.
where is the secret hideout on spy island
The BAD Hideout is to the right of Toupee Terrace, the farthest point to the right on the island. It is protected by lasers and is the last part of the island quest. To enter, you need the Ultra Vision Goggles and the Fingerprint from the BAD Bistro.
boat
There is no key on Spy Island. The "vault" holding the first spy has a large hole in its ceiling. The door at the BAD hideout (satellite control station) is opened using a fingerprint from the BAD Bistro. (see related questions)
Get the fingerprint from the BAD agent at the Bistro, and use the goggles to get into the BAD hideout to the right of Toupee Terrace. (see related questions)
they are used for keeping the agent held prisonerThe dogs on spy island are in the dock Hideout
Get the fingerprint from the B.A.D. Bistro. With that and the Ultra-Vision Googls, you can enter the BAD Hideout to the right of Toupee Terrace. (see related question)
To complete Spy Island on Poptropica, rescue each of the 3 missing spies (in order) and acquire the spy items and the fingerprint from the Bistro. Then you can enter the BAD hideout to the right of Toupee Terrace. (There are complete solutions at both of the related questions.)
The fingerprint is the other thing you need (besides the Ultra Vision Goggles) to get into the BAD hideout to the right of Toupee Terrace. If you have rescued all the spies, go to the BAD hideout. If not, rescue the spies first. (see related questions)
"Spy headquarters" is where the good-guys are, the large building where you land on Spy island. The hideout for B.A.D. is to the far right of the island, past Toupee Terrace. (see related question)
you get some glasses from a spy that was traped hint 'the spy is a girl and is in a greenhouse
Sorry, it is a known glitch in the Spy Island program. Sometimes during the final battles (mini-bots or Director D) they will stop attacking you. You have to reboot Poptropica and play the sequence again, beginning with your arrival at the BAD hideout.