If you plan on offering winter tours, you ought to read the TOS first. They are on the front page above the posts. Trust me, you'll be doing yourself a big favor. I'd hate to ruin your business because you didn't read the sites disclaimer.
Yes I just joined this site a few hours ago, and I do plan on being a contributing member, and yes I am also trying to offer my winter tours. My goal is to cater the backpacker flyfishermen who want a productive tour but is not loaded with cash. Really depends on the wind current/patterns, a good shore breeze can help with the dissemination of the skeets. Also, being prepared with lightweight pants and longsleeve shirts, cap and neck wrap can repel them. Casting from the Mangrove inlets is productive, take a Kayak out and explore the inlets and many Mangrove estuaries and you will find plenty of fish. Personally, after fishing near Tulum for over a year, Skeeters were the least of my worries. Where they attack you is while you are dining in a restaurant at night, because they migrate under the wooden tables knowing there will be humans returning there each night! But I have no problems dodging insects if I am hooking into random tropical fish, for me, that's what it is all there for!
Do you plan on being a contributing member of this site or are you just trying to drum up business? As I remember... the mosquitoes in Tulum were the size of sparrows and attacked in large formations the size of migrating flocks of geese. Can't imagine fishing while dodging them.
Mid December 2011 till mid Jan 2012 will offer some great Flyfishing tours from Tulum (3 hr/south of Cancun), down to the Boca and beyond to Ascension Bay. I have lived and guided in this area for over a year and love taking people to some remote fisheries. Contact me with any questions, I know and love this place! My tours are independently guided, supplied with new rods/reels/leader material, & dozens of specific hand tied flies I personally create for these waters(like flies for spooky Bonefish, and lots of Epoxy head flies). and my rates are affordable. Contact me for more info and I will be glad to answer any questions regarding fishing or just visiting the Tulum area and what there is to do around there! Is a spectacular area, with unlimited options, that is where you must make up your mind and narrow down priorities! (easier said than done...). So much to do here!