Hello member, Congrats for the good news at first hand. Well a honeymoon is a very special time where both of them where you get lot of time to be with each other, know each others likes and dislikes. You come to know each other deeply. I think a place where you both get most of the time for just you two is the best, after all the harsh city lives and everyday busy streets are enough to be around people. At honeymoon, you should feel that it's just you two in this world and no one around.
For such a experience i would recommend you few good places around India. As i know you are from Goa so it is a hot region all the year round, you don't experience the cold and cozy feel of the winters anytime. And what would be best than a couple in and around a city that is cold? You can try going to the near by places like Munnar, Kerala. This is my favorite destination. If you are going in May, it is possible that Kerala is going to be hot at the most. So i suggest you do not look around for places in Kerala but just directly visit Munnar. I promise you that it won't disappoint you, if not too cold. It won't be hot either, also the tea gardens, the fresh aroma of tea, the clear climate, silent waves of breeze and the sweet smell of flowers there will make you fall in love. To get the ultimate exprience you can book hotel at Club Mahindra, they are the one situated at the edge of the height from where you will get the best views. Also you can take a stroll around the roads there, as they are very quite and very much peaceful and private. You can also visit Thekkady from there for ultimate Elephant experiences.
Another best place will be Kashmir. I would not suggest you Jammu, because again Jammu is below Kashmir and would be as hot as 30 degrees there, but the month you have chosen as your honeymoon is the best time if you are planning for Jammu Kashmir as the snow start melting in March and you have some best view of snow, glacier as well as the new flora that is born during the season. If you go to Kashmir you will get some awesome view of Gulmarg, Sonmarg the Amarnath hills etc. They are the best nature can offer to us. So beautiful, so cold and so lovable. The skies are so clear and the surrounding and people are so good that you feel blessed there. The hotels, houseboats are very cheaper there as compared anywhere. But see that you are reading daily news about the place as it is little bit attentive to visitors. Rest i have been there and the defense and army are helpful and make it very safe to travel.
Third you can watch out for Sikkim, Meghalaya, Assam. The place on my destination book. It is a place like heaven again. The time May is best. It is a place of Buddhism, Monks, Monasteries, Holy chanting, Chinese bells, Tea gardens, loving people and an awesome climate. These places are a must visit. Nepal is another holy place to travel. These places make you feel spiritually charged and blessed.
You can inquire about travel details from some of the best travel and tour guides online. Before going any traveler should study about the place they want to visit. Most of the time, we waste our time in searching and knowing things when we are in the new place. Internet makes you available every detail. So study everything about the place you are going, the means of travel, vehicles to take, food to eat, Restaurants, what to buy, where to shop, what to see. If you have these things in your pocket your trip is going to be perfect. Also do not forget to take a road map with you.
Hope this helps.