If it's not somewhere that requires advance reservations, I've had great luck with that.

One instance that sticks out in my mind was Kinsale, Ireland, where the guests ahead of us were all demanding reservations at Fishy Fishy (and some upset that the concierge called over and found it fully booked). She told us, "I think I can get you in at Supper Club, and honestly, it's a lot better food and less touristy."

The place deserves a star (IIRC, it was on the Bib Gourmand list anyway). Fantastic food and service, and it wasn't even on our radar before we asked the hotel clerk where she'd recommend.

We have had similar experiences in Tokyo, Croatia, Greece... I mean, yeah, sometimes the concierge steers you right to a tourist trap, but more often than not, we've had great luck.

Not good for advance planning, though...