The main area of shops, royal villa, gardens and hall of inspiration are close and easy to see in about 4 hours but phra that doi tung is about 9km away and there is no transport to get there so you have to walk which makes it a difficult hike for the day.
Skywalk and Zipline - in the garden (Requires buying a ticket for the garden) there is a canopy walk (few bridges among the tree tops) and 3 short ziplines. Ticket 150 THB, zipline is optional.
Ticket prices are 90 bht for each of the 4 sites or you can buy a ticket for all 4 sites for 220 bht.
Food at the cafeteria and shops is somewhat expensive so if you want a bit cheaper day then pack your own lunch. There are day market down the road a few hundred meters where you can get cheaper foods etc.
There is a souvenir shop and plant shop and other cafes etc
Restaurant on Doi Tung is very renowned for fresh vegetable salad and have winter vegetables to choose and buy various kinds. Such as tomatoes, especially in the winter. Including fresh fried oyster mushroom is known as well. Visitors should also try fresh coffee Arabica varieties of the famous Doi Tung. The coffee is excellent quality. Through seed selection standards. The smell and taste are tested before sale. This ensures that the coffee tastes and smell best. Macadamia are grown as opium substitute coffee Arabica varieties. Doi Tung Development Project has hired people to collect seeds and juice into a sauce ,and available product flavors. The packaging is beautiful. In addition, all of the above. Doi Tung is also fresh vegetables and a delicious dessert waiting for tourists to visit. Subsidies and good quality products produced by Thailand.
There is really only one spot at the top to stay at, the Doi Tung Royal Villa (advance reservations generally required as it books up). However, there are many other accommodation options further down the hill and along the way to both Mae Sai and Chiang Rai.