3 hours Open Slot - must eat!

Our first night at WDW I expect to have 3 hours - including transportation time - to grab a good meal. We are staying at POP. Where do you recommend? Is the Boardwalk doable in that amount of time?

Boardwalk is doable. If you don’t have your own car, just take an Uber.
You could take Disney bus to HS and then walk to Boardwalk, but that would probably take much longer.
Lots of options at Boardwalk, as well as Beaches & Cream at BC and Crew’s Cup at YC.