I just finished the MQ at level 28 and I still have about a hundred things lined up in the quest journal, mostly the misc stuff but I have yet to do most of the College stuff and haven't touched the Companions line yet. I also still have about half of the Word Walls to find and most of the Dragon Priest masks. Look in your journal, pick a quest and head on off in that direction, if you're level 27 you either still have a ton of stuff you can do or need to start talking to NPCs to get the quests :)