Another option at level 80 is to head straight into max level PvP. Like heroic dungeons, there is also a daily PvP quest available from an NPC near your faction’s battlemasters. Completing the daily “Call to Arms!” quest is a good way to get some bonus honor for battlefields you’d probably be participating in anyway.
Chances are you won’t be the best fighter on the battlefield in your fresh level 80 gear. Not to worry, though, because honor comes quickly and it shouldn’t take you long to get a decent set of PvP gear going on.

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My personal favorite level 80 PvP venue is
Lake Wintergrasp. Most of the combat out here takes place in
vehicles or turrets, so your lack of gear will not hinder you as much, provided you can find a way to get the five kills necessary to unlock the ability to pilot siege vehicles.
There are also several Wintergrasp-specific quests that you can get from your faction’s basecamp while on offense or inside the keep while defending. Completing these quests awards not only honor and money, but also Stone Keeper’s Shards that can be used to purchase unique mounts and heirloom items.