You can do multiple things in Goa like clubbing, Waters sports, beach games and other adventures like trekking. if you are fond of historical places then there are number of places in Goa where you can pay a visit.
Go for Snorkeling, Scuba Diving
Ocean Trek Tek to waterfall Rafting at Valpoi river learn surfing Quad biking Camping ..Goa is an amazing place to explore lot many things..
Explore South Goa (Extended) like Colva beach which will give you amazing sunset views and Palolem beach North Goa(Extended) here you can visit Arambol which is a 1 hr drive from Candolim and is much less crowded than any of the beaches in North Goa. Water activities you can do anywhere (outside india).