Perth (Kings Park, Bell Tower, beaches...) and Fremantle (Rodnest Island, nice cafes, go and have a drink/meal at little creatures :-)). Hide north: Pinnacles, Kalbarri NP, Monkey Mia (dolphins). Enjoy!

Make sure and spend a couple days at Cable Beach by Broome. Its one of the prettiest beaches I have ever seen. And Snorkelling at Torqouise Bay is absolutly amazing you can see as much snorelling as you can diving! And the Karigini National Park is really cool its a bunch of gorges that you can expolore... the water can be really cold depending on when you go but its worth it, I would go again in a heart beat. Check out some pictures of it

You, can visit the famous, bell tower, Kings Park and we have just got our own "London Eye". There are also beautiful wildlife parks, where you can cuddle koalas. If you come in Summer all the beaches are open if you plan on going country you should visit Kalbarri or Margaret River.

there are some great trip by gapadventures.com and intrepidtravel.com. You might want to check them out, or check what they have on their itinerary.

I swam with the dolphins, rode on a catamaran & took a desert tour around the Pinnacles.

Perth is just the greatest cities in the world. Try Rottnest Island, Monkey Mia, check out Fremantle, wonderful ethnic restaurants, etc.

Perth is a very pleasant city with awesome city beaches. If you head down south, make sure you do some trekking in the Karri forests, they are beautiful! Also don't miss Cape Le Grand NP close to Esperance, Le Grand Beach is one of the most amazing beaches I have ever seen, and there is nobody around. If you head north of Perth, see the Pinnacles, Kalbarri NP and the town kalbarri itself, it's super chilled out. If you are travelling with a 4WD, go to Francois Péron NP in shark bay, absolutely fabulous coastline! Further north there is Exmouth and the adjacent Marine Park on the peninsula, where you can just go into the water on one of the amazing white beaches and be right in the middle of coral reefs with great marine life, perfect for a few days of snorkelling. Broome is nice, but I find it overrated, make up your own mind about it. My fav part of WA if not if the whole country is the Kimberley in far northern WA. It is pretty wild and you will need a 4WD for most of it. But even without you can go to places such as El Questro, Windjana gorge, Tunnel creek or Geike Gorge. Hidden Valley NP right next to the NT-boarder twon Kununurra is in my opinion is extremely underrated. Being tiny and easily it is a perfect half day trip, and the nature in there is absolutely stunning. Whatever you will be doing, have fun. :)