Goa has been blessed with various rivers along with our beautiful coastline. Several years ago, rivers were bring used for mobility of people, I have heard stories from my parents that long back several boats used to ferry people within islands. As of of only the govt. operated ferries continue to exist.
Instead of spending more on the road network, several water taxis & water buses can be introduced in the state. We can start with fossil fuel operated and then move on to solar powered or even Hydrogen powered boats. Boats of capacity upto 100 passengers will help ease the load on the road plus will help with hinter island connectivity without spending large amounts on bridges and connecting roads which can also cause more damage to environment plus utilities precious & scarce land.
So more mobility via rivers via small sustainable boats!