Go for North Goa tour for one day South Goa tour for next day Explore beautiful beaches of Goa Admire the beauty of Churches of Goa, feel the Portuguese culture of Goa
For north goa I would suggest party. from calugute to arambol it's a party place. in arambol there are places to come together with community and dance, sing and do a lot of other things. In south goa I would suggest to go for wildlife sanctuaries, caves, hiking across beaches.
Enjoy night life Definitely plan a day to explore Dudhsagar falls for there are lots to do around. Enrol for water sports Shop in flea markets
Visit and spend time in a beach shack
Visit forts
Do a cruise trip. Goa is a great place for solo travellers. Stay safe and enjoy your best.