I do several overnight canyon runs every year, sometime charters sometimes just with friends. You can see the boat and get more info at my website
Http://www.makomania.net Don't go expecting a wahoo, they are fairly rare Most common catch are yellowfin and albacore, mahi-mahi are also a good possibility. Other, less common catches include White and blue marlin, bigeye tuna, and wahoo.
The fishing is trolling during the day and chunking at night, most of my equipment is 6 foot stand-up rods with Penn International 80Ws on them. Feel free to PM me with questions.