Hey Devaditya, It's safe to travel to goa for woman gang. Some of the precautions need to be take care specially don't roam alone at night. Some of the best places one can explore in Goa are baga Beach, old basicila church, boating.
If you want to go for partying and crowded place: North goa is best. Baga, calanguate, sequerium are good beaches. Anjuna is good one to stay as well. If you wana chill and be with yourself go to south Goa.
Agonda beach has plethora of huts option and safe to stay.
They will enjoy more if they stay in North Goa somewhere between the Candolim to Baga beach stretch...Some of the popular beaches in North Goa are Baga, Vagator, Anjuna, Morjim and Arambol... if they are in Goa for the weekend then the best places to party in North Goa are Cavala on a Friday night, Cohiba or Favela on a Saturday night. These places are close to Baga... they can also visit the Saturday Night Bazaar in Arpora.
You dont actually need an itinerary to travel within Goa.It is a leisure holiday where you can spend time at different places as per your choices.
Both famous for watersports and chilling at shacks