Goboro Reef: There's quest markers for each step of this one. It starts at /setwaypoint 4352, 8338 on top of the coral. He'll send you to the Temple of Ranri /setwaypoint 3980, 7887 where you'll meet Mitch in a cage. Mitch gives his own quest to collect mats for the puppets. You'll then have to kill Jellies in the marked locations in the Blackwater Forest to the east, obtain the 40 stack of both crafted mats through whatever means (crafting/AH/minions/etc.) and buy the Inelastic Thread for 1p (under Reagents in the Rift store). Turn that into Mitch and he'll then send you back to the starting point to complete it fully.
Draumheim: Starts at /setwaypoint 5975, 5997 on the upper platform. Simply fall out of the sea over the zone to reach there. You can then find the Captain and his crew in the sea above the zone on the shipwreck here /setwaypoint 5471, 6969.
Tarken Glacier: Starts on top of Mount Sharax at /setwaypoint 4827, 1850. All you have to do is sled down the hill and follow the path laid out by the red orbs. Be careful as you get closer to the bottom as the sled "physics" are a bit wonky and can send you flying off the path and over a cliff. The quest will complete when you hit the last checkpoint.