This is the ultimate destination for many Thai trekkers. 
The goal is to hike up to  the summit and conquer the distance of 1,325 meters above sea level. At the top  of Phu Kradueng is a wide plain of about 60 square kilometers. There is a  cold-climate pine forest and a grass field full of wild flowers and orchids that  bloom in different seasons. In addition, there are several lovely waterfalls and  an observation point that is provides spectacular views during sunrise and  sunset.
To get there, take  Bangkok-Loei bus and get off at Pha Nok Khao, the boundary between Khon Kaen and  Loei.
 From there, take a  mini-bus to the park office at the foot of the mountain and walk up Phu Kradueng  for 6 kilometers. The park is open during October to May and closed during the  rainy season to rejuvenate the flora and fauna. Park attractions include: Pha  Nok Aen, the cliff that offers a breathtaking view of the crimson sunrise, Pha  Lom Sak, a sandstone ledge jutting into space providing a fine view of the hills  and valleys and Pha Yiap Mek, where cottony clouds suggest a misty world of  shadow figures.
The park is open to  visitors from 7.00 a.m. until 2.00 p.m. daily and is closed for forest  regeneration during 1 June – 30 September every year. 
Admission : Adult 400  baht, Child 200 baht
Facilities:
Phu Kradueng National Park  provides accommodations and has stores selling food and drinks. Call the Park at  0 4287 1333 or 0 2561 4292 – 4 (Department of National Parks, Wildlife and  Plants in Bangkok) or click http://www.dnp.go.th/ for more information and  reservations.
