Ok... the Dwaynas Quest is (like mentioned) the following:
(yes, allready been stated... i'm just doing a step to step guide for it)
1. Speak to: Old Nikoles in Lions Arch, close to the Guild Registrar
2. Speak to: Joy (next to the Henchmen)
3. Speak to: Scrappy (close to the Beach)
4. Beam to Ascalon
5. Speak to: Kyle (next to Symon the Scribe, you can find him when you're taking the stairs and head left from Tydus)
6. Beam to Droknar's Forge
7. Speak to: King Jalis. He is standing on that strange triangle inbetween two bridges above the Trade District (close to the Glint Statue)
8. Beam to Lion's Arch
9. Speak to: Magi Malaquire (The NPC you also got the first Signet of Capture from, standing atop a hill)
10. Speak to: Scrappy (still at the place he was last time)
11. Beam to Beetletun.
12. Form a party or head out solo (expect some heavy health degen and enchantment removal, accompanied with some heavy healing from Genths Balance - but no interrupts)
13. Head the way your Quest Marker points (as if you'd be heading for the North Kryta Province to farm Ettins)
14. Speak to Scrappy, watch Freezie getting born
15. Take out some waves of enemies
16. Claim reward
Don't bother with the Grenth's Quest yet, it is bugged and can't be completed as of now.
About the other Christmas Items though...
Candy Cane Shards drop basically everywhere, so your best bet would be to farm where lots of mobs are. And the best thing... noobs buy those for about 1 platin each.
The other Christmas Items you can get are basically the "farm x, exchange x for z" type of Quests.
So far i've been farming Gates of Kryta (see the Oink Oink Stickie) and got myself lots of decayed orr emblems (which you can exchange for christmas items) and candy cane shards (which you can exchange for christmas weapons or scam some newbies with).