RF AC sir,I've got some information for you-
1 and 2. I've no clue about those.
3. Not bitterly cold as in North India.
4.Cars do go to the Marine National Park. Some distance away,you'll have to park your car.
5.Local...
more... attractions include Lakhota Lake,Darbaargarh,Local bazaars excellent for some shopping if you want to.