This is a hidden gem of the Bienne/Biel area. There's a bus that'll take you from the main train…read morestation to a dedicated stop just for Taubenloch. Once you arrive there, you'll want to look for the sign (see the attached pictures) that says "Taubenlochschlucht Entree des Gorges" (on 2 lines) instead of the Google Maps directions. When you get to the Taubenloch stop, cross the street then turn left then turn right onto the side street. Go up some stairs right before the first building (it may feel like you're entering the building) and you'll see the sign; continue along the trail there. The coordinates are at: 47.1534543,7.2671388 and I highly recommend taking a look at the area on Google Streetview first since I got kinda lost when I stepped off the bus here. See if you can find the same sign I posted below there since that's where the trail starts.
I visited here on a blazing hot day in late May (though coming from Texas, it was hardly unusual but I had happened to come to Switzerland during a heat wave) and I felt almost an instant sense of relief when I entered the gorge. It felt peaceful hearing the rushing water and breathing the fresh and moist air of the gorge, not to mention the canopy of the trees blocking out most of the sunlight. The pictures I've attached are worth a thousand words.
I encountered almost no other tourists when I was here and nearly everyone was a local. The trail is well-traveled enough that you should feel reasonably safe even if you're hiking alone but not too crowded.
I only traversed the trail until I reached a parking lot with a restaurant and continued a little after but although the trail continues in a loop, it starts to veer away from the gorge at that point.