Head to North Goa. You will enjoy most.
Baga Beach, Calangute Beach, Candolim Beach, Vagator Beach & Old latin quarter of Goa
Head to South Goa and check out these beautiful beaches.
Palolem Beach, Cola beach & Butterfly Beach
Day 1-north Goa . anjuna, vagator , morjim , Calangute beach spend evening at chapora or aguada fort
day2 - visit south Goa palolem , Candolim and other beaches.. visit churches and old Goa too... spend evening in cruise
day3- do water sports at island...
day4- Dudhsagar waterfalls (must visit)