Mae Hong Son is surrounded by mountains and punctuated by small but picturesque Nong Jong Kham( Jong Kham lake). This town is still peacefull compare to Chiang Mai. The town's population is mostly Shan. Plenty guesthouses and hotels are available. From cheap to expansive. The area around the town is famous for it's Karen and Shan villages, who can be visit by day trips.
Best way to come to Mae Hong Son is by air. Several flight a day are going from Chiang mai to Mae Hong Son and backwards. A flight to Mae Hong Son takes 50 minutes. If you take the local bus to Mae Hong Son, you will be longer on the way to it. It takes about 11 hours with the local bus, who will stop for anything. It's worth trying it. And very cheap!
Mae Hong Son is best visit between November and March when the town its most beautiful. During the raining season( June to October) travel in the province can be difficult because of the few paved roads.