The gang shares in Sambuca shots on Rook Island's beach in Far Cry 3 before they are kidnapped by Vaas and his pirates.
This is part of the intro cinematic, which was recorded on Jason's phone and is later played back to them in the cage by Vaas.
Taking the shots leads them to a jetskiing adventure, a sea turtle sighting under the ocean, and a skydiving expedition. When the gang land on the beach after skydiving, they find themselves trapped by pirates and attempt an ultimately unsuccessful escape, as revealed in a later mission in Hoyt's compound.