Last night my pally just Dinged 50 and did most of his leveling post Highpass Keep in Velious. This is an outstanding outdoor zone, which as a ranger you would absolutely rock! Consider the following:
1) Starting at level 24 quite a few people go to Highpass Keep and kill goblins. It sometimes is hard to get a spot in a goblin group, but if your patient and work well with others this normally isn't a huge problem. Stay here until level 37 or 38.
2) Iceclad Ocean is a perfect soloing zone that isn't heavily utilized and even contains a soulbinder. Just north of Dev 1 in N Ro is a dock that takes you to Velious. Every 2 game hours (about 15 min) a raft will appear that will take you to a tiny island. One the opposite side of the island from the raft landing is the Icebreaker dock. Take the gnomish Icebreaker and it will eventually deposit you on the docks of the Iceclad ocean. The spell binder is on the dock. (Note; some people prefer going through the Great Divide & Eastern Wastes in order to get here. As a low level I found this to be rather dangerous and prefer taking the slower (albeit safer) ship route). Hunt snow cougars here from 38-44. They rarely will drop a cougar claw earring which sells nicely in the Bazaar.
3) Around Level 44 you will stop getting XP from the snow cougars. The best place to hunt next is the eastern side (next to the Dragon Bridge) of the Eastern Wastes. You can get here either by running through the Iceclad Ocean and dodging the giant bridge guards, or is you have the POP expansion you can go through the Great Divide (which has a POK book).
If you go through the Great Divide on the left side is a ridge that spans the mountains which is pretty safe to run along. You will occasionally see frost giant scouts, but they are pretty easy to outrun. A large rift in the mountains will lead you to the Eastern Wastes. You will want to hang a left and go north and follow the circumferance of the island. Keep following the ocean (going clockwise around the circular zone) past a dwarf camp, an Ulthork camp, and another dwarf camp to the Dragon Bridge. This area will be your home until level 50.
Here you can hunt Rygorr Orcs in the camp just north of the bridge, snow cougars, snow dervishes, mammoths, tundra kodiaks, ulthorks, walruses, snow griffons, and eventually frost giants in the Ulthork camp. The XP is awsome and the cash isn't bad either. If you get into trouble simply zone across the dragon bridge.
Although the Eastern Wastes and Great Divide are slowly becoming more popular, most people are in the zone to attack the orc fort in the center of the island. There are also some awsome quests including the ring of war series. Anyone who has done time in Everfrost would feel right at home here.
p.s. Bring plenty of provisions with you for there are no vendors and it is a long run back home.