wud recommend Betong since ive been there more than 10 times.
food recommended there : Chicken rice, Seafood, Dim sum, and "Tong Shui"
but only if you know where to find. cos diff stalls and restaurants diff price and taste.
its a far journey but worth it cos cheap.
Even their hotel there RM50 only per night and not those ciplak wan. at least 3 stars and above.
Have fun there!