Try havelock islands in andaman. it's affordable and you will have your own private beach time in kalapathar beach. just stop your scooter on any point along the stretch of road and go down to the beach. and voila! you have your own private beach.
You can go to Kerala also , Himachal Pradesh and Uttrakhand etc ... although if 50k is your budget and you are a nature lover then Bhutan is the best choice for peace and nature
Hi DhananJay, I would suggest you try Sri Lanka. Its an upcoming honeymoon destination well withing budget. If you want to go extravagant, that's also possible in Sri Lanka.