Signal Hill Reserve has been set up as a MTB rider's paradise, as well as a lovely area for walking or taking in the sights of the city
Park up at Centennial memorial and take a 700m stroll (or ride) down the hill to the cache site. It's a lovely downhill stroll from the carpark but remember that you'll have to walk back up approximately 120m (vertical) on the return journey. If you're doing this at night remember to mark your car's location when you start or turn track logging on. As this is a shared recreation area, keep a wary eye out for cyclists and other recreation users.
You can also walk up from Butts Rd, by Logan Park School, or up from Ravensbourne using the track from the end of Rimu St at S45 51.743 E170 32.974
You're looking for a 2ltr plastic container. And just if you're wondering, "Signal the Frog" is geocaching.com's mascot.