I took a short trip to Chiang Mai in March with the family. Just a few days. We visited an Elephant sanctuary and a place called the Bua Thong waterfall — for which there is no Wikipedia article a pitty!. The waterfall is also known as “Sticky Waterfall” because the calcium rich waters have created cascading mounds of limestone and there is very little algae on the rocks meaning you can get a very good footing in the limestone and despite the relatively steep incline you can walk up and down the face of the waterfall with ease. It was very fun and refreshing walking around in the cool water in the 40° temperature, lots of green (most of the area was more brown than green this time of year) and lots of butterflies.
The photo above is of the Chedi at Wat Chedi Luang [wikipedia.org] —which does have a wikipedia page! The Wat is very beautiful and I was there just in time to catch the wonderful light at sunset. You can see a few more photos in in the photoset on filckr [flickr.com].