All the national parks are under the management of CALM (Conservation and Land Management).  A small entrance fee applies to some of the parks, if you plan on visiting the parks on a regular base, it is worth getting a pass.  Contact your CALM to hear about all the options with regard to the passes.
Most parks are easily accessible and have camping sites.  They are spread across this vast state and therefore have an astonishing variety of fauna, flora, climate and landforms. 
To illustrate let me give you a glimpse by telling you about a few parks that immediately spring to mind.

Ningaloo Reef Marine park
If diving, snorkeling and fishing are your favourite passtimes, then this is the park for you.  The reef is easily accesible with more than 200 different species of coral.  If this isn't enough to tempt you, how about the mass spawning of the coral during March or the passing of the humpback whales. Read more in our Coral Coast section.

Yanchep National Park
This park a favourite destination for a day outing about 5o km north of Perth.  What sets it apart from the rest are the limestone caves, the colony of koalas and all the waterfowl.

Karinjini National Park
When you think Karinjini, you think gorges.  It is set in the Hamersley Range. 

Purnululu National Park
More popularly known as the Bungle Bungles.  This is rugged terrain, access is by 4WD only.  To really appreciate the orange and black striped domes you need to take to the air.

The above examples are just the tip of the iceberg.  I am sure you will agree that each and every park is a holiday destination in itself. We look forward to share this diversity with you.