Torban says, "I'd be happy to keep watch, but give me a second set of eyes, one of the kobolds would be fine."

Obvious subtext is one kobold is a light hostage in case the other kobolds think of causing trouble.

Darglen nods her assent to this.

"Good idea," Brekka nods, understanding Torban's intent.

His sword gleams brightly in the morning light as he finishes his morning routine with a practiced polishing of the blade.

"Let's get going. We should take full advantage of the day ahead."

Mathias nods in agreement to Brekka's statement. As the party prepares to head off, the druid casts his cantrip again to determine what sort of weather they would have to deal with today. 

The weather reveals itself to be bright and sunny.

Mathias's prediction of the weather proves true and you approach the keep. The land has grown rugged, with tree and shrub cover intermittent. It slopes up to the northeast and southwest into full mountains, whereas the northwest track you are following seems to be funneling you into a narrow pass.

I would like everyone to make two checks. Pick one pair of skills:  Perception and Stealth, Perception and Survival, or Survival and Stealth.
The first check in the pair will determine what information you gain on the approach.
The second will determine the likelihood you are spotted.
You can take advantage from the kobolds on one of the two checks.
Let me know which checks you do, and your results for both.

Kaelen checks- Perception with advantage: 14, Stealth: 15

Also History in case it might give him more insight on the architecture or something: 15

[[Advantaged Perception: 8 (double 3's, what can you do?)  , Survival: 17]]

Perception (advantage from kobolds): 22.

Stealth (advantage from luck point): 24

Asariel's dance techniques allow him to move silently as he keeps a sharp eye out. 

Arista
Perception: 16
Survival with help: 13