I'll let you know about an inexpensive fishing boat we've chartered for October. Don't know yet how it will compare to some of the "fleets" but will give you an update. Also the best deal I found for "cooking fish" unless you want to cook it yourself is at Sharky's Tacos Beer & Fun ... they're located about a block from Medano beach and will cook the fish 5 ways (styles) serve it with sides and trimmings for $5.00 a person.
Drinking like a fish? Hmmmm .... I'd say start out with bloody mary's for breakfast, follow up with after breakfast drinks, continue with beer ... about mid-day throw in some energy drink mixed with vodka, follow up with more drinking .... evening time slow it down with a few beers and make sure you eat. Night time .... just drink til you drop :) Don't get stupid and make sure you have your ride back to the resort set up .... don't walk the streets intoxicated and alone .... Not good.