Upon leaving the freeway in Longtan, depending on the bus company you will either get off at the first stop (100 meters from the freeway interchange) or at the downtown stop. If you get off at the downtown stop, you will find plenty of taxis waiting around, but not so with the Longtan Interchange stop. (Except for the Taichung Bus Company, all buses stop at both at the interchange and downtown.)
The usual fare to Kunlun Gardens is $300, but if you find a taxi with a Peace Fest sticker in the window, the rate is $250. If no such taxis are in the vicinity, then call 0934-278665 and ask to be picked up, for a $250 ride.