Reaching 80 on Rag/DW takes several days, honestly. You get rested XP as long as you're logged out, no matter where your character is. I don't think you'll be sitting AFK in inns only to get Rested (I remember one girl who used to do that, no matter how many times I explained her).
Don't do chain quests which force you to switch zones. Go to zones with lots of quests and once you've completed the main set and you see you're running out of quests there, switch to another quest-rich zone. Don't rely on dungeons, unless you have a friend 80lvl to boost you and you have several quests in that dungeon. Don't think about the quest lore, chain rewards or anything, think only about which zone is best for your level and has the most quests. Easy 80lvl.