Firefly Trip: unknown to many there is a wonderful trip up one of the rivers here by boat that leads into an area filled with fireflies at night… majestic… This is one of Koh Changs hidden gems for sure!
Head down to Klong Prao village and turn at the Ramayana Hotel and follow the road until it turns. Look for Phu Talay restaurant, or head around the corner and look for Moleys Resort or Sea Breeze Restaurant, or to the end of the street at Iyara Restaurant and see if they can arrange a boat for you. Phu Talay (south end) and Iyara (north end) each have a supper cruise and the other two places mentioned can arrange for a local boatman to take you up, or get you a kayak to head into the river and give full directions.
Please be aware that this Firefly trip can really depend on the season and the weather. Check with the people mentioned above to see if they are around or back hiding deeper in the jungle. It can be very much a seasonal and even weekly good or bad time!