On december 2015 I went to goa with my friends from bangalore. We were there for 7 days and each day was awesome. hope goa is having 32 diff beaches and we took 2bhk appartment in callamgutte. Is very close to beach too. First two days we enjoyed with sea rides and games, cost offerdabled. Parachute ride was really good.
Later we went to baga beach and Saturday beach was awesome, many things to buy over there. If you have girl friend or sister or wife you will spend your total evening over there?
Out of all beaches I personally like anjanaa beach, beach is with few rocks and we can get awesome pics in evening time. I no need to tell anything about boozing and night pubs. They are really cool.
Plan accordingly and have a safe trip