First time poster here, and trying to plan my trip to Australia for 10 days in early August. This will be my first time in Australia (got the $650 dollar flight from NYC),and just wanted to see what you guys think of my itinerary and if you have any suggestions. I tried to not do too much so I can enjoy it, instead of constantly traveling. I originally wanted to do cairns and great barrier reef but felt its a bit pricey and decided to do Tasmania instead ( I'm sure I will be back in Australia to see the other sites at some point).

For a frame of reference I am a 30 year old male traveling alone who is looking for a mix of eco-tourism, cultural tourism, and nightlife. I'm planning to stay at a mix of hostels and hotels throughout the trip. Also I wanted to ask how the water temperatures are in Australia in the winter, can I swim at all? Thanks!

Day 1 Sydney - Day trip to Katoomba on the train. Plan to see the three sisters and blue mountains. Overnight in Kings Cross

Day 2 Sydney - Plan to rent a car drive to Kangaroo Valley, Jervis Bay and Kiama. Plan to see kiama blowhole. Dive back at night and return car next morning. Overnight in Kings Cross

Day 3 Sydney - Check out Bondi Beach, Opera house, and maybe the local zoo. Overnight in Bondi

Day 4 Sydney - Check out Fish market, Royal botanic garden, take ferry to Manly Beach. Overnight in Manly

Day 5 Sydney - Not sure yet - keeping day open.

Day 6 Hobart (Tasmania) - Morning flight to Hobart - walk up mount wellington, and take a tour of a local brewery/ whisky distillery. Overnight in Downtown Hobart

Day 7 Port Arthur (Tasmania) - Rent a car and drive to Port Arthur and tour fortescue bay. Stay overnight in Eaglehawk neck bay

Day 8 Swansea (Tasmania) - Drive to Swansea and on the way stop over to see Maria Island and tour island. In Swansea - do a fairy penguin tour and eat at Melshell Oysters. Stay Overnight in Swansea

Day 9 Bicheno (Tasmania) - Drive to Bicheno and on the way see the Freycinet peninsula and Coles bay. See the devils in the dark tour in Bicheno. Overnight stay in Bicheno

Day 10 Hobart (Tasmania) - Drive Back to Hobart - open day. Overnight in Hobart

Day 11 Sydney (Australia) - Flight back to Sydney - open day. Overnight stay in Sydney (maybe closer to airport)