Re: fishing in the surf
That sounds like a pretty good selection on flies. You could add some Crease flies or poppers, they're fun to fish and specks lady fish and reds (occasionally) will whack them.
I'd use your floater and have at it. When you get down there stop in a tackle shop and see if you can pick up some Ande (for mexico) and ask about flats and tides to fish that might give you a shot. I'd also look around for coves to fish, it'll give you some shelter from winds if they're howling.