Hmm, Tannyss, I don't want to sound like I'm putting you down, but at 26 the world is a Ranger's oyster. There are dozens of places you can get to and there was a time when the only thing a level 26 Ranger ever did was solo.
The easiest, if you are from Surefall, is the Karanas, North, South and East. Runnyeye and High Keep are right there as well.
If you are from Kelethin, Dagnors Cauldron is a great place to go. Groups in Unrest are still good for you, then the islands in Ocean of Tears.
Of course you can grab a spire ride and go to them all in a flash.
Then there is Hollowshade Moore just outside PC. Lake of Ill Omen via Firiona Vie. Stonebrunt Mountains, via the boat from Qeynos, if you do not have PoP, otherwise just use the books of course.
Groups are where you find them, spread all over Norrath and the moon these days. Use your LFG window, it really works!