Hey buddy,
I took the wifey to Ambergris for the honeymoon and since I work for a sportsman travel company they hooked me up and we fished a few days while there. We were there Nov. 16-21 2009. Yes all the gotchas, and bitters and all work but these bonefish see alot of flies. Just from the clients our competitors send they have seen everything not to mention the people that DIY fish. I fished with a guy we regularly use out of Ambergris and he is only $225 for a full day and fishes all around Caulker and Crab Keys etc... The fly and I mean THE fly was a yellow Charlie with pearl flash. That is Yellow as in crayon yellow not the super bright stuff but just claves tail yellow with clear rib and a little flash. size 6 and 8. I was hooking up on property at Victoria House(where we stayed) when the pinks, tans, whites were not even getting a look.
Also, get a beach cruiser bike and head south of san pedro on the beach and look for bones tailing. My wife and I grabbed bikes, made a cocktail and cruised the beach and spotted and hooked up with fish.
Tarpon liked the Black Death from Umpqua.
If you need anything else. do not hesitate to PM me.