After realizing that Valor Points are almost worthless once you get all the Valor Quartermaster's gear I am driving towards increasing my achievements raising my Archeology to it's zenith and getting more companion pets and mounts. The best way to get more pet companions is to raid the auction house. There are usually pets available for cheap that you probably didn't know existed. Anything lower than 500 gold that I have yet to attain I will simply buy it. After that it gets a bit more complicated.

I am also farming Netherwing reputation so I can eventually get the six different colored Netherwing Drakes. I'm 4-5 days away from getting exalted reputation and have had fun doing it. It's important to me to go back to the Burning Crusade expansion and enjoy all the fun writing and quest creation that went into the first expansion of World of Warcraft. I started playing during the third expansion (Wrath of the Lich King) so doing all of this is a totally new experience and informs my play in the newer content. I can see now where some of the inspiration for current quest-lines come from and it has opened my eyes.
I got to enjoy an entertaining (and very rep friendly) quest-line called Earning Your Wings. Just know that Wing Commander Mulverick and other parodies from the movie Top Gun make appearances and I even got an achievement (Skyshattered) to boot after defeating Captain Skybreaker. You basically have to stay close to NPCs as they zip around Netherwing island and throw projectiles that knock you back and can eventually knock you off your mount, effectively ending in a failure of the quest. There are six NPCs you have to defeat, ascending in difficulty. I had never seen this type of quest before in the new content so it was fun to try even though I got discouraged on the last two.
On another front I am farming Northrend for all the rep I can get. The Kalu'ak have three daily quests (about 1,500 rep per day total) that are distributed along the south of the continent and the Frenzyheart have three dailies in Scholazar Basin. These will take a while to get up to exalted but it will be worth the end result of a pet (Nurtured Penguin Egg) and epic fishing pole (Mastercraft Kalu'ak Fishing Pole) along with several different achieves.
The perfect thing to do when you are going back through old content is to do Archeology if you have yet to do so. I raised my Archeology professional skill to 525 from 0 in the last 1.5 weeks. This took a lot of work and honestly I would say it wasn't worth the work if it wasn't for the 3 companion pets I have picked up during that time: The Voodoo Figurine, The Clockwork Gnome and the Fossilized Hatchling. As far as Companions pets and Mounts I am still looking to unearth Pterrordax Hatchling, the Crawling Claw and the Fossilized Raptor so even when you raise your skills to max in this profession there will be things to go for and I am looking forward to the chase.
Doing all of this on a daily basis including doing the cooking dailies in both Dalaran and Stormwind goes through my allotted 25 daily quests and takes up a fair amount of time.
This is just a quick look at what I am doing on my main at the moment. If these are some things that you have yet to accomplish in the World of Warcraft I highly suggest you do so, especially if you got into the game on the later side, as I did. There's plenty more that I didn't go into detail on and I have loads of other characters just waiting for me to take more of a shine to them.