You can catch Strait Magic from Siesia and then Tony's island tours on Thursday Island.
A couple of years ago we did the Peddells tour to TI and it included lunch, transfers, tour around TI including the Grassy Hill fort and museum, tour on Horn Island around WW2 sites and small war museum out the back. I highly recommend it, great information about the history of the islands.
If you overnight at TI Kazu Pearl on Friday Island is a great trip to a working pearl farm and a great lunch.
Trips to the outer islands would usually mean selling some bodily organs on the black market!!
A beautiful part of the world.