This small public playground is in the Mürren village, near the sports center. It has swings, slide, small climbing wall, and a couple other amusements.
It's free to use and doesn't require a long hike or extra mountain lift to access. If you are staying overnight in the village, it's a nice place for kids to run out extra energy in the afternoon. Also good place for a family picnic.
📍See location on Google Maps.