Here's an ideal itinerary for 3 days in Goa:

Day 1:

• Start your day with a visit to the famous Basilica of Bom Jesus, a UNESCO World Heritage Site and one of the oldest churches in India.
• Next, head to the nearby Se Cathedral, another beautiful church that is worth exploring.
• After that, take a stroll through the charming streets of Fontainhas, the Latin Quarter of Panaji, and admire the colorful Portuguese-style houses.
• For lunch, head to Ritz Classic in Panaji for some delicious Goan cuisine.
• In the afternoon, head to the popular Baga Beach and spend some time soaking up the sun, swimming in the sea, or trying out some water sports.
• End your day with a sunset cruise on the Mandovi River, where you can enjoy some live music, dance performances, and stunning views of the city.

Day 2:

• Start your day early and head to the Dudhsagar Waterfalls, one of the most popular tourist attractions in Goa. You can either hike to the falls or take a jeep safari.
• After returning from the falls, head to the nearby spice plantations and learn about the various spices grown in Goa.
• For lunch, head to Martin's Corner in Betalbatim for some mouth-watering seafood.
• In the evening, head to Anjuna Beach and explore the famous Wednesday Flea Market, where you can shop for souvenirs, clothes, jewelry, and more.
• End your day with a bonfire and some live music at Curlies Shack on Anjuna Beach.

Day 3:

• Start your day with a visit to the Aguada Fort, a 17th-century fort that offers stunning views of the Arabian Sea.
• Next, head to the nearby Sinquerim Beach and try out some water sports like parasailing, jet skiing, or banana boat rides.
• For lunch, head to Gunpowder in Assagao for some delicious Goan-Portuguese fusion cuisine.
• In the afternoon, head to the charming village of Old Goa and explore the various churches and cathedrals like St. Francis of Assisi Church, Church of Our Lady of the Rosary, and more.
• End your day with a sunset at Vagator Beach and enjoy some live music and drinks at Thalassa, a popular Greek restaurant on the beach.

Hope this helps you plan your trip to Goa!