What has been very popular round here (I have not tried it myself but it seems to work well) are Bridge and Scrabble weekends off season. People go mad for it. There is also the possibility of fishing packages if your location lends to it. Golf is popular round here but they tend to be hard drinkers and while they spend a lot they are hard work. Anything connected to a hobby is good even better if you do it yourself. How about cooking? Or have people pay for a week's B&B training? I consider this now and again as there doesn't seem to be anyone running courses like this anywhere near me but I don't know if I could stand the company lol..