Explore the 17th-century Portuguese fort that was built to guard against Dutch and Marathas invasions. Take a tour of the lighthouse and soak in the stunning views of the Arabian Sea. Take a stroll on Sinquerim beach which is located below the fort and enjoy the beachside shacks serving variety of seafood.
Visit the famous Basilica of Bom Jesus, a UNESCO World Heritage site, and the remains of St. Francis Xavier. Take a walk through the winding streets of Old Goa and admire the colonial architecture of various institutions such as the Sé Cathedral, Church of St. Cajetan, and the Archaeological Museum of Goa.
Visit Dudhsagar falls, which is one of the tallest waterfalls in India. Take a train ride from Kulem to the falls, trek to the base of the falls, and enjoy a refreshing swim in the pool at the base of the falls. Bring your own food and drinks as there are no food stalls/shops there.
Relax on the beautiful Agonda and Palolem beaches. Go for a swim, take a stroll through the colorful market, and indulge in the variety of food and drinks offered at the beach shacks. Enjoy the beach nightlife, do not forget to try the local favorite Feni!
If you have more time, you can visit Sunburn Festival, Panaji Market, Anjuna Market, Grande Island and Calangute Beach. Do not take a car on day 3 as it is inaccessible near the falls. If you have less time, consider skipping the Dudhsagar falls as the journey time to reach there will take up most of the day.