Found this on what to bring
"¢ Please wear non-slip shoes
"¢ Don't forget your camera/film
"¢ Bring a small backpack or bag with a change of clothes in case you get wet!
"¢ Also, depending on the weather, a raincoat and/or sun protection. "¢ Bring insect repellent
"¢ The itineraries are example of the activities that usually take place on the tours. The order of activities varies depending on the weather, timing and many other factors.
Should be in the 90's as May is at the end of the hot season, and the beginning of the wet season. not sure about the pith hat