I rarely ride the City Circle Tram but had to last night to get to my destination. I noticed loads of discounts for Melbourne attractions that can be found by just showing your valid Myki card(ticketing system). I think these discount were previously obtained by getting a Myki visitors pack but seems like its now open to all Myki card holders.
Anyone carrying a myki can show it at the following City Circle partners to receive discounts
Eureka Skydeck - 10 per cent discount on entry
IMAX Melbourne - 20 per discount on entry to the film currently being advertised inside City Circle trams (Penguin movie)
Lightning Ridge Opals - 10 per cent discount on all products
Luna Park - 10 per cent discount off a single unlimited ride ticket
Medibank Icehouse - Free skate hire
National Trust - 10 per cent discount on entry to Old Melbourne Gaol and Polly Woodside
Melbourne Aquarium - 20 per cent discount
Tours on Trikes - Third person travels for free on every two hour ride
Zoos Victoria - 10 per cent off at the Zoo Victoria Shop.
Cool deal. Surprising how little non-tourists know about these deals. I assume you're aware of the voucher booklet inside each Melbourne Tourist Guide Magazine available everywhere, on the free City Tram, Fed Square, etc?
That has discounts for the Melbourne Star Ferris Wheel, Aquarium, Icehouse, Draculas, Old Melbourne Gaol, Sovereign Hill, Melbourne Museum - Aztec Exhibition, River Cruises, National Sports Museum, Chill On Ice Lounge, the Pancake Parlour & a few other things.
Oh and Puffing Billy - HAZAAAHHH!