Hi RAHUL Check all the stuff's mentioned above and please do check out the islands like divar island, vanixm island like so....it is fun to explore these island . If you're on a budget try staying in backpacker hostel happy travelling!!!!!
Scuba diving and water sports are a must if you are travelling to Goa. Apart from beaches and alcohol Goa has a lot more to offer. Also try to attend the Goa International Jazz Festival This international jazz festival is held at the Stone Water Eco Resort in Santarem Beach, close to Vasco da Gama. Many bands from more than 10 countries participate in this 3-day event that is held between November 27th and 29th. Its a fun and party event that promised a lot.
As everyone said about adventurous activities like scuba diving, para sailing and many more. i wanted to tell you that don't miss out the scenic views of Goa. Streets of panjim, few churches and aguda fort. 3 most happening beaches - Baga beach, candolim beach, calangute beach where these beaches lie nearby to each other.
You can also visit anjuna beach, vagator beach and chapora fort are on the same way.
Every traveller flew with his or her own thoughts. Here I mentioned my opinion. It's depend on you now, what you wanna do in your solo trip. But in any conditions my wishes are always with you. Have a fun there