Your route .
Vik — 2 nights stay
Pickup self drive car at Reykjavik airport.
Arrive in Reykjavik airport and drive down to your hotel in Vik..
Reynisfjara - Black Sand Beach.
Drive down to Geysir
Geysir — 2 nights stay
Checkout of your hotel. Drive down to Geysir. Check-in to your new hotel..
Take your flight back to India. Hope you end up with a lot of memories and a few souvenirs too..