Not sure on Circus Mexicus - been to nearly all of them. Comes right on the heels of getting back from Mazatlan for a week, so may not be able to get down there. No fears on Sinaloa, either. Actually, I love Mazatlan. Very dynamic and beautiful city. Haven't been back there in a few years, so the wife and I decided it was time to go! It's *not* Cabo and there aren't gringo tourists everywhere, which adds to its charm. For folks that only know Penasco as "Mexico," there's just so much more they are missing!