You can plan your Goa visit very precisely day 1 - South Goa day 2- north Goa day 3- you can hangout at various places such as clubs also you can go for random street food and stuff.
day 4 - dudh Sagar is what you can plan for 4th day day 5- leisure day or else you can go for water sports and secret islands where you can go for scuba diving
Tripoto offers various packages to Goa. Maybe you can check those and customise your package accordingly. You can head to the beaches, old Goa church , Aquada fort , Lighthouse etc. so if you don't wish to go with a package , plan your trip and include these in your itinerary.