The Gili Islands are arguably a highlight of Bali. In just an hour, a ferry can transport you from Bali to the Islands. There are 3 Gili Islands: Gili Trawangan, Gili Meno, and Gili Air. Gili T is by far the most populous of the islands. It's where young backpackers come to party at night and lie on the beach during the day.
We stayed on Gili T for a few days at the Kupu Kupu Cottages. This is by far my favorite AirBnb that I have ever had the pleasure of staying. Gili T is tiny. You can walk or bike all the way around the island. But despite its small size, there are plenty of things to do and eat. You can take a half day snorkeling trip around the 3 islands, chill in the many cafes, or enjoy the beach. I would highly recommend a snorkeling or diving trip. We saw school of fish, coral reefs, and even some sea turtles!
You can also take a day trip to the other islands. We took a boat to Gili Meno for the day and just enjoyed the quiet there.
The Gili Island is beautiful and if you want some time on the beach, this is a great place to be.