If you were out and about near Princes Bridge any time last December, chances are you spied some brave souls fanging it over the Yarra on a zipline. No, you weren't dreaming — that was indeed the 130-metre-long Firefly Zipline, which for a short, sell-out season had people soaring from Federation Square to Alexandra Gardens enjoying a unique adrenaline rush. And now, it's back. Yep, from Friday, December 16–Saturday, January 28, Firefly Zipline will make its return for an extended run of thrills (and hopefully no spills). Speed-demons of any age will be able to book a ticket, don a safety harness and helmet, and enjoy a hurtling flight over the Yarra, either solo or alongside a mate. Cruising six metres above the water and clocking speeds of up to 35 kilometres per hour, it's the ride you never knew you needed in your life. And just in case you need a little more adrenaline this summer, Firefly is unveiling a new experience for the season, dubbed the Firefly Quick Jump. Once you've got your kicks soaring over water, you can put your wits to the test with a simulated freefall experience off the top of a 10-metre-high platform. There's no age limit for zipline flyers, though anyone under 18 will need a parent or guardian present to sign their waiver, and kids under 16 will have to ride with a paying adult. You'll also need to weigh between 25 and 120 kilograms to jump aboard. It's recommended you get in quick though, with limited tickets available. Firefly Zipline will operate multiple sessions daily from December 16–January 28. Tickets are $59 for adults, $49 for kids and $195 for a family of four. The Quick Jump clocks in at $25, with combo tickets available. Buy yours online.