Escape Bali and take a Day trip (or longer if you can) to the beautiful Gili Islands,
The Gili Islands are located in between Bali & Lombok, and take about a 2 hour boat ride from Benoa Harbour (20 minutes from Kuta)
There are 3 islands – Gili T, Gili Meno & Gili Air.
If you only have 1 day, personally I would go straight to Gili T as this is the biggest of the islands. There are restaurants (amazing fresh seafood) live music, pristine beaches, water sports & plenty of places to snorkel, or hire a bike and ride around the island (approx. 1 hour)
Fastboats from Bali to Gili leave at various time throughout the day, you can take 25kg of luggage with you and it's about a 1 and a half hour trip from padang bai or a 3-4 hour trip from Benoa Harbour.
(be prepared for your stop at Gili, the boat just anchors near the beach, so you have to jump out and carry your suitcase on your head while you walk through the water! )
You can buy tickets online, or from tourist offices, I prefer to use the little local businesses, you can discuss price with them and if its not a busy day you will get your transport to the harbour & boat ticket prices super cheap!