The sunrise hike up Mount Batur (Bara Batur) is famous in Bali. Locally considered to be a sacred mountain, Mount Batur is an active volcano. It’s totally safe, though, and a must-see for any nature lover.
You can trek the mountain solo or as part of a group tour. In either case, you’ll want to leave around two and a half hours before sunrise. It’s an easy hike, but you’ll definitely need good shoes, so you don’t slip on the descent.