I would recommend Krabi and Phi Phi Island. You can book an private room with private pool and enjoy your honeymoon. The entire trip would suffice under one lakh with airfare plus to spice it up spend one night at Bond Island in Phuket. If you want less travel time then Sri Lanka is the ideal one and you also get options of private beach where you have the beach exclusive to you where none other than you and partner would be allowed with no other eavesdropping on you.
Hey Vish, These are the places you can go for honeymoon with the budget you have :- Srilanka ... Malaysia ... Krabi island in Thailand ... Bhutan is also best... Bali in Indonesia would be the best of best option for you ... Also see that you have to select a part of these countries and plan accordingly ... Happy Travelling Bro!!!
Mauritius will be a good option . Weather will be around 20-21 degrees Direct 5 hour fight from India and visa on arrival. You can explore everything in 5-6 days. Beautiful beach resorts available in all budget. Also food will not be an issue.