May might bring the rains, but that also gives you the perfect reason to head to Nam Nao National Park to see a rare flower which blossoms only once a year. This and next month, orchid lovers will have the chance to witness the blooming of the delicate euang bussarakham wild orchid, whose stem can reach lengths of up to two meters. To avoid disappointment, check with TAT Phitsanulok (055-252-742/3, 055-259-907) before planning your trip.