Welcome to Goa, it is extremely sheltered to Visit in Goa, its famous for its beach culture, temples, churches, wilderness, water sports, goa hotels. as you said it's your first visit in Goa, relies upon what are your side interests and like. you didn't mention where you will stay so please reply if you want Now the question of Most popular sightseeing in Goa. if you don't mind discover as take after.
following blog guide for goa tourism