You must visit Guwahati then you will get there varieties of food at very low cost and you can go to restaurants like table talk, foodvilla, and even street food are the best place for you if you are a rich foodie.
Auroville - it's a very peaceful place
Rock beach
Paradise beach
Serenity beach
And U must have to try Le Dupleix - it's a hotel. Amazing food and live music. It's a best relaxation.
I think it will be closed. You may get updates through online portals only. Or you may call a homestay there and ask. They will guide you throughout. Tirthan has wonderful people.
January indeed a perfect time to Visit Andaman. Perfect weather i would say and you can enjoy all the water sports activities which normally not available during monsoon time.
I would suggest to go with running shoes(waterproof/gum boots) as it will prevent ur toes from getting freezed and stiffed(insensitive). You will be able to enjoy for more time in snow with boots than sneakers😃