Continue to Stormwind
Buy a gryphon ride from the gryphon master Thor, then bring Lewis' Note to Osric Strang, in the shop Limited Immunity, in the Old Town of Stormwind.
Lewis' NoteDescription
For a small fee, you can take a gryphon to Stormwind, so you can deliver Lewis' note to Osric. You won't get there faster any other way.
If that sounds acceptable, then just speak to me again when you're ready for the ride. I'll charge you a little, but trust me; it'll be worth it!
Progress
You've been traveling, eh? Have you been anywhere interesting?
Completion
Ah, a note from Quartermaster Lewis? I'm not surprised he needs more gear. Sentinel Hill is far away, in a land Stormwind has all but forgotten.
Well thank you, <name>. Here's some money to cover your travel costs.
Rewards
Money: 1 75
Reputation: Stormwind +50