Doi Inthanon, Thailand’s highest peak (2565m), is located in southern Chiang Mai province. ‘Doi’ is Lanna Thai for ‘mountain’ by the way.
It’s a nice drive through the countryside if you rent a motorbike from Chiang Mai, though a bit of a long one. It’s roughly two hours from the Old Town in Chiang Mai to the peak. The view is worth it though; pure Lanna highlands.
Views are the best from December to late February but bring a hoody and warm pants. Don’t drive up in shorts and a t-shirt on a motorbike; you’ll freeze your ass off.
In rainy season (late May to November) the view can be obscured by clouds and you may end up standing in a cloud-bank which, though a novel experience, is hardly worth the trip. Check the weather forecast before going.