Beside of seeing the sun, you will also find many plants and small animals.
Anyway, if you’re planning to go up to the peak, you need to be in perfect condition, because the way is quite rough and all vehicles are not allowed. You need to walk on your feet only. Therefore if you have a heart disease or bone disease, you should avoid this activity or you will get worse.
To go up to the peak, you can go by yourself or hire a guide for 300 Baht from the office of the national park. Don’t forget to bring water and food with you too. Believe it, you don’t want to get too exhausted and collapse to the ground. The road is quite steep, but if you walk carefully, it will be safe.