This Sunday P and I spent the better part of the morning exploring the roads around Doi Suthep by motorbike. We went up past the temple (Wat Prathat Doi Suthep), over the mountain and down the other side (you need a serious dirt-bike for this as the road turns into a rutted track). The views were spectacular - we drove through coffe and lychee plantations and paddy fields where farmers were harvesting rice. By the time we descended to Huay Tung Tao we were starving and stopped for lunch.
Huay Tung Tao is a fresh water reservoir located in a park about 12 km from Chiang Mai city center. It's the perfect place to relax by the water and enjoy a leisurely meal. There are several floating restaurants to choose from, and also boats for hire. In the mornings and evenings it's also nice just to take a walk along the water.
How to get there (without crossing an entire mountain on a dirt-bike) - drive north on Canal Road towards Mae Rim, turn left after the 700 Year Stadium and follow the signs for Huay Tung Tao Lake.