Around 70 ethnic groups populate this mountainous, forested country. Men are expected to be monks for at least a short time and women must not intentionally occupy a physical space above a man, to protect his spiritual status. A foreign influence is seen in the national sport, a form of bowls. Tourists prefer tubing down the river. Name the country.
Laos fits the mountainous, forested, monks and tubing bits, and probably the spiritual status one, but I don't know of it having a national sport particularly like bowls.
Best of luck. It sounds as if it ought to be somewhere in that direction.