So I was running a D&D adventure for my gf and my brother during the holidays last year, and basically I stranded them on an island with a bunch of orc pirates running around. At a certain point, they began to wonder how they would ever defeat the orcs and/or escape and/or at least gain a level. So they consulted my step-dad.
My step-dad, who is an ex-Army ranger, former undercover cop, and former investigator for the DOJ (and now makes hardwood furniture for a living) pondered this for a moment and said,
"What you should do is wait for them to send patrols out at night. Kill them one or two at a time. Whittle them down until there are just a few of them. Eventually, they will stop sending out patrols. At that point, you can stake out their camp, look for a vulnerability in their perimeter, and attack their leader with sudden surprise. Orcs see in the dark, right? Better do it in daylight."
So at least one answer is "my step-dad," who is likely at least 6th level, but does not own a tavern. He does keep a custom +1 Colt .45 around for emergencies, though.