Road Sign in Panaji. Intersection of the busy 18th June Road and the Heliodoro Salgado Road in Panaji, Goa.
It's not because that none has shared what they've done before. There are tons of advices and suggestions out there.
Goa has way too much to offer in terms of things to do and see.That's precisely the very source of your dilemma. Now you need to pick and package that into a practical itinerary that suits both your taste and time in hand.
Goa is about 100 km of travel from its northern tip to southern tip, easily takes about 2 hours to drive through. If travel from the west to east, it's about 75km from the sea side to the mountainous eastern border of Goa. What you want to cover in your itinerary lies within this.
South Goa Itineraries :
South Goa Itinerary Map Western Ghats Region
South Goa map in detail with itinerary path to cover the beaches south of Margao. Colva Beach to Polem Beach distance is about 65km, if you follow the NH17 highway. And it would be about a 100km+ distance drive if you include many of the short detours on in this itinerary. Follow this path to plan your day's itinerary, keeping Margao as the start/end point and cover attractions south of Margao, along the coastline.