None.
NK’s have no money and there is nothing there for tourists to see ‘cept for statues and pics of the Kim family.....and there is no heat anywhere so any tourist season would be for half a year at most......
Until the NK’s are free, nothing will happen.
Back in the 90s at least, up around the DMZ, there was a market for rat and snake soju (literally a bottle of soju with a rat or snake in it. Think tequila worm only bigger). These were smuggled from the DPRK, and were an exclusive item up around the Munsan area. Given the millennial predilection for bath salts and tide pods, I would think an entrepreneurial nork could sell a whole lot of the stuff in the USA at a handsome profit.