Answering Questions I Had Before Going to Australia- Hostels? Snakes? Spiders? Getting Around? Cost?

Answering questions I had before going to Australia about cost, getting around, snakes and spiders.
Our Itinerary:
Day 1: Leave UK late PM- flight to Dubai
Day 2: Flight Dubai to Melbourne
Day 3: Flight to Uluru. Land late PM. Watched sunset from Imalung Lookout
Day 4: Sunrise base walk around Uluru
Field of Light sunset experience
Day 5: Flight to Melbourne mid afternoon
Day 6: Flight to Cairns and chill at lagoon
Day 7: Great Barrier Reef
Day 8: Atherton Tablelands
Day 9: Bus to Airlie Beach
Day 10: Chill day at Airlie Beach lagoon
Day 11: Whitsundays day tour
Overnight bus to Rainbow Beach
Day 12: Chill day Rainbow Beach
Day 13: Fraser Island
Day 14: afternoon bus to Brisbane
Day 15: Australia Zoo
Day 16: Bus to Byron Bay- afternoon explore
Day 17: Chill day- walk to Byron Bay lighthouse
Overnight bus to Sydney
Day 18: Sydney mooch and afternoon trip to Bondi Beach
Day 19: Blue Mountains
Day 20: Coogee to Bondi walk
Late evening flight to London
oceanrafting.c... Whitsundays tour
passions.com.au/ Great Barrier Reef tour
www.greyhound.... Greyhound buses
www.ayersrockr... Uluru/Ayers Rock resort