Visit islands less frequented in Thailand Koh Tao to Nangyuan. it is an entire island to yourselves.. A bit of a travel but a great getaway. Air tickets are also at it's cheapest currently from India.
If you really want to visit a nice destination, I would suggest the country Georgia. If it's possible to up your budget, then you can go to Turkey. 100 k and below can also buy you a nice honeymoon package to the Andaman and Nicobar Islands.
To give you some ballpark figures, the list includes the approximate travel and stay costs. Your actual costs for each destination, however, can vary depending on your budget, where you stay and what you do. Here you go - http://www.instatravelstyle.com/foreign-trips-under-one-lakh/