Start off your nature-filled trip in Goa with a visit to the Cotigao Wildlife Sanctuary, which is known for its verdant forests and a variety of animal species like deer, porcupines, and bison. You can also go bird watching here, and maybe spot some rare birds like black woodpeckers or Malabar trogons. Take a guided tour to get the most out of your experience and learn about the flora and fauna of the sanctuary.
No trip to Goa is complete without a visit to the majestic Dudhsagar Falls. This four-tiered waterfall is nestled in the lush greenery of the Western Ghats and is one of the tallest waterfalls in India. You can take a dip in the natural pool at the base of the waterfall or go trekking in the surrounding forests. Keep in mind that the falls can get crowded during peak tourist season, so plan accordingly.
If you have more time, you could consider adding a visit to the Bhagwan Mahaveer Sanctuary, which is home to the state animal of Goa, the gaur, and other animal species like panthers and tigers. You could also take a ferry to Chorao Island and visit the Salim Ali Bird Sanctuary. If you have less time, you could skip the Cotigao Wildlife Sanctuary and spend more time at the Dudhsagar Falls. Keep in mind that the trek to the falls can be challenging, so make sure you're prepared with comfortable shoes and enough water.