To explain about the history of the mountains my wife has a relative with a drug habit that fucked up his life and ended up living on the mountain and sand mining illegally. The police would drag him away and and then he would just go back again with his digger. All the inlaws were afraid of him as he is violent and has attacked and threatened them before.
Grief. There's always one in every family, isn't there? My Taiwanese side of the family has a couple of mafiosi cousins (i.e., idiot kids who think it's clever to join a gang and become the boss's fall guy when the police come sniffing around). One of the things that really bothers me about Taiwanese society is the "keep quiet, don't make trouble" attitude to these characters. Back in the old country (both of them) there's usually a patriarch type who will sort them out, either by setting him straight or breaking his arms, whichever works best.
I did have a crazy idea to do Hakka outdoor cookouts on weekends for city folk or tourists going to Dahu. I have to check how the mountain is located (only been there twice) and there are no dwellings or electricity up to the site I believe. Whenever there is a funeral or wedding the older inlaws get together and cook these amazing authentic dishes with locally grown chicken and duck etc.
It sounds to me like you've got all the ingredients there for a successful business. Taiwanese people + good food = profit. A lot of work to set up, certainly, but once done it should be cheap to operate.
How big is it? I'd guess you need at least 1.5ha to make it worthwhile.
I suppose the key problem would be transport or road access. People need to be able to either drive there, or you need to provide some sort of shuttle from the nearest rail station/bus stop/large car park. An electric-scooter hire station, perhaps? I've seen those operating successfully in a few tourist areas. Power is not a problem - solar panels are dirt-cheap these days and one of my side projects is infrastructure-class PV system controllers (hint hint). I strongly recommend composting toilets, which are very clean as long as you build them properly (you have to install a powered air duct to create negative pressure in the actual toilet and draw air through the composting chamber). I seem to average 100 litres of rainwater per month from a very crude 1m2 collector; you could install a sand filter followed by an off-the-shelf reverse osmosis unit for water supply. The mosquitoes - I'm thinking traps. Lots of containers filled with grungy water which will attract egg-laying females more often than the bamboo. Empty them out when full of larvae. These are all things I intend to experiment with myself soon, so I'll let you know if it really works or not!
btw, if it's a sensitive area, I bet you could milk that to the max. Not only could you use it for advertising purposes ('area of outstanding natural beauty' and all that), it might also help stop customers trashing the place, which city-dwellers are wont to do.