You should not visit goa in summer as too much hot and hunid weather will be there.
but if you r vsiting than you can go for beaches like
vagator beach Anjuna beach and flea market
Aguoda fort Donapaula beach
Reis Mogos fort Titos lane and mambos dics at baga beach
Other than beach chilling ( must visit beach :- Agonda (south) Colva Benaulim (south)
1. Moonlight kayaking at Bambolim beach 2. Hot air ballon if it interests you much 3. All water adventure activities at various beaches 4. Dolphin ride 5. Try beach shacks at Vegator
Hey, it'll be really really hot there if you can postpone your plan then please do it.
but if you insist on going then you can cover both north and south Goa in 3 days.
Go to North first, enjoy all the hippie life in tito's lane along with beaches like Baga, Calangute, Anjuna also go to chapora and aguada fort. Do water sports if you like.
Then on last day go to South Goa to relax yourself. You can do dolphin spotting or just chill at beach shacks as south Goa beaches are more peaceful than North.
Hope this helps...
First day do visit the beaches in the morning and visit Agauda or Chopta fort during the time of sunset for enjoying amazing views. At night stay in the beach for enjoying the cool breeze and loud music. Day 2: either go for Dudhsagar if you really want to go. Else you can go to south goa for visiting beaches. You can also take bath if you really want to. Day 3: Either keep it for churches or you can go for adventure sports like scuba, parasailing, banana boat ride. You can book the trip through Thrillophilia. you can go for Casino as well to try out your luck. You should go to Majorda beach for its white sand. You can go to Anne's Church, Parra for amazing that road of Dear Zindagi (if you want to click pictures) P.s If you are rich then you can go for cruise as well.