World Of Warcraft Leveling?

OK, I'm a level 38 Night Elf Druid, and my friend is a level 41 NIght Elf Hunter, he claims I can't catch up to his level, I believe I can. What are some good quests, places to grind, or ANYTHING to do, that I can catch up to his level. Person to give me the best quests, grind areas etc. gets BEST ANSWER.