Visit Baga Beach at night
Go for a sunset at Aguada Fort
Do try water sports at candolim as I found the water is much better than Vagator for water activities.
Probably cause social circle have hyped it up. I always keep on telling my friends explore India first, you'll be surprised by how beautiful our country is!
In my view, you shouldn't. Four of my friends went for the trek but the day they reached Uttrakhand, glacier burst happened and we aren't able to contact them till now.
You get some "ME" time which most of us usually don't get these days. You tend to meet more people and interact with them, which is lesser when compared to travelling in groups or with your friends. You will end up clicking pictures of things around you, which turn into beautiful memories when you look back! :)