Well, advertising wise I think that you are on one of the big sites. A couple of others that come to mind for the English speaking public are www.cyclingnews.com, www.pezcyclingnews.com and of course www.bicycling.com (the latter very focussed on the US crowd). I assume you intend to target the English speakers...
When I have vacationed with my bicycle, I have always been partial to hotels that allow for safe bicycle parking (remember most of the people on these types of sites think nothing of spending upwards of 3 to 5K Euro on one of their several bikes). That meant SECURE parking in a locked away garage of some sort, or even better having you the hotelier suggesting that I keep my pride and joy in my room with me. 🙂
A specific room set up as a mechanic's shop (bike stand, a set of tools and the possibility to wash and clean my bicycle) are a close second.
Excellent and ample food, distractions in the general area (beaches, amusement parks, etc) for the wife and kids for when I ride also help.
Of course, the sine qua non are the roads close to your hotel. If there aren't spectacularly scenic roads, with little traffic good road conditions and a variety of 100km loops, then I will not even come to your neck of the woods. Might as well stay home and not spend the money. Then again, I live in Rome... 😎
Hope this helps. Best luck for the business.