Fear kiting Mammoths in Everfrost hands down. You get 10 plat off each tusk, and sometimes the same from the Mammoth meat (check Bazaar before you sell to a vendor!).
With tracking, Spirit of Wolf and Panic Animal, you're set for at least five fun and fast levels. Remember that Fear Kiting is your great opportunity to safely work on all your weapon skills, 1HS, 2HS, 1HB, 2HB. Working weapon skills obviously makes for slower kills, but you'll love it later that you don't have to start from scratch.
Plus, being in Everfrost puts you near the Wayfarer's camp, so you can travel all over the world very fast, if a group comes up - or do LDoN's even, if you can find a group for that.
Good luck ranger!