I am about to head into the darkness and embark on a two-hour group hike through the woods. I pay close attention as our guide goes over pre-hike information: Keep my headlamp on the red-light option.

Travel adventures, from goat hikes to snorkeling, get even better when they’re done under the stars. By Amy Thomas Hiking and kayaking in the daytime? Fun and invigorating. But under a full moon, ...