Walking sounds great! 15 minutes doesn't seem that long.

Now a follow-up question:
What's the quickest way to walk there? Tell me if this is sufficient or if I should use another route:

1. Leave UA terminal (T7, well since I'm arriving on UX, T8)
2. Walk across Parking Structures heading towards T1
3. Right turn at T1, follow roadway to Sepulveda.
4. Left on Sepulveda until I reach In-N-Out.

Any problems with that? If so, feel free to list the directions you know of/used in the past.

Thanks.