I don't want to spoil your excitement but want to be honest with you. Perth, is a bit dull in winter. It really is a summer city, I first arrived in Perth in Sep 2008, I couldn't believe how dead the place was mid week. On Fridays and Saturdays it came to life a bit but nothing that compares to any city in the UK. In August expect Perth to be wet, and not very warm (avg daytime temp of around 8 - 10c).
At the time of year you're going you'll see the best that Perth has to offer in about a week.
Perth
- Kings Park - This place has the best views of the city.
- Swan Valley Tour - make sure this includes the Caversham Wildlife park
- Take in the atmosphere of Fremantle on a Saturday or Sunday arvo - defiinitly go to Little Creatures Brewery. The "Rogers" ale is the best!
- Sunset at Cottesloe is awesome
- Good night spots are - Leederville, Fremantle, Mt Lawley although as I said mid week in the winter won't be great - stay away from NorthBridge it's rough at night!
- If you like Casinos then Burswood is worth a visit.
South of Perth
- Bussleton Jetty - it's just been re-opened after a couple of years of repairs - it is a 1.5km long jetty, over some beautiful waters.
- Pinjarra - Pies - the Aussies won't let you forget how good their pies are & how *** British pies are, put them to the test!
- Denmark - As has already been said - stunning!
- Walpole - Do the tree top walk it's great.
Margaret River - even though this is South of Perth there is lots to do so it get's its own section
- Waves Restaurant in the town is fantastic - esp for seafood
- There are three main caves in the area (Mamouth, Jewel & Lake) Mamouth and Lake are the best
- Hamelin Bay - There is a road here that goes right to the coast, and on a day when the water is calm, massive rays (2m+) come right up to the beach and you can snorkel with them (carefully we don't want a tourist doing a Steve Irwin impression) and they regularly take food from the hands of the local fishermen
- There are tonnes of wine & beer tours all over Margaret river - but to be honest I would recommend the bushtucker river & cave tour (http://www.bushtuckertours.com/brivertour.html)
- Can't not mention wineries - my personal favorite was Happs
- Cape Leeuwin light house - great views - it's hard to get any decent height in WA for good viewing points.
North of Perth
Most of the good stuff North of Perth requires some serious distance to be done. But there are some gems especially if you dive.
- Monkey Mia - Experience wild dolphins up close and personal, you can do this around Perth too, but here it's pretty much guaranteed
- Exmouth - Some of the best diving in Australia, unlike the Barrier reef which is hours & hours by boat off the coast, the reefs on the north west coast are right off the shore.
Some of the stuff that I've been told not to bother with in WA are...
- Wave Rock - A long journey to see a rock shaped roughly like a wave
- The Pinnacles - Billy Connolly danced around them naked - that's the only way he could make them interesting
This has turned into a massive post but I will say one more thing, if I were you - once I had seen enough of Perth, I would head straight to the North East of Australia. At the time of year you're going it's the best place to be, and it's considerably cheaper than Perth. The rain Forrest is fantastic so much to see and do.
Either way I'm sure you'll have a great time, but expect to pay about 6quid a pint in Perth!