When the U.S. military was in South Vietnam, this space was known as Radar Hill because of the extensive radar installation on this, the highest point on the coastline for hundreds of miles. Today, you can zipline off of the radar installation and ride a simple roller coaster around its base. Pony rides, go-carts and boat rides in the manmade lake are among the activities. Other animal shows and games are quite good, but are not scheduled every day. The weekends are a sure bet for getting the most for your money.
There are not a lot of great options here.