Queensland's cheap public transport - Go Card Senior

It even comes with a card wallet and instruction leaflet

Our Senior Go Cards just arrived in the mail. Couldn't have easier.
My wife and I are living in Melbourne, Victoria. We plan to use public transport in Brisbane when we visit next month. We applied online, citing our Victorian Seniors Card numbers. The system in Sydney is more complicated and your Opal Card (Senior) only last 2 months for interstate visitors.
The card is free (you pay $10, but the $5 deposit is refundable and the card comes with $5 of pre-stored value).
You can use the card for 50% off travel on trains, buses, light rail (new Gold Coast link) and Brisbane River ferries/Citycats. If you travel off-peak ( between 8:30 a.m. and 3:30 p.m., after 7 p.m. on weekdays and all on weekends) it is a further 20% discount.
You can use the card in Queensland tourist areas (Sunshine Coast and Cairns). Once you get your card (posted to any state or territory in Australia within 10 business days,) you can register online for auto top-ups. Validity of the Go Card Senior is 10 years. Queensland is certainly tourist-friendly.

Go to translink.com.au

Comfortable train journey to Brisbane from Varsity Lakes (closest station to Gold Coast Airport). Easy bus transfer from airport (Route 760).

City Cat ferry - great way to explore Brisbane 

You can travel to all stops on the Brisbane River for around $1.30 (round trip, if you stay on board). The red "City Hopper" ferry (limited stops) is a free service.

City Cat interior