Practical information about Ao Manao
After entrering into the miliary base, you have to sign the register to get a pass and sign it again when you leave.
Activities offered on weekends and holidays are: one hour of horse riding with a monitor (500 THB), archery (100 THB) , sea kayaking (300 THB), ATV rental. You'll find it on the other side of the road.
There are two large hotels at the beginning of Ao Manao beach, but they are usually full reserved by Thai agencies or tour operators for their groups . Anyway, I recomend you to stay in guesthouses or hotels in the city and take a bike to go to Ao Manao.