Sure is. Just don't forget warm clothes.

Sachin, yes you can visit Lake and Zoo in the evening. But i suggest, visit Zoo first as else it will become dark and all the animals will go inside their cages and you will not be able to enjoy your visit to the Zoo. Also check timings of Last entry to the Zoo, i think its 1000 hrs to 1630 hrs . In case you want to enjoy sunset and boating than go for boating in the evening, moreover temperature will also become comfortable. Its awesome experience to do boating in Naini lake in the evening. Enjoy your visit.

If the person is fit and active, why not. However, if the person isn't in a good shape, strictly no. The incline is pretty steep. After visiting every enclosure, you need to climb steps to move to the next enclosure. There is a good chance you not seeing much animals simply because they refuse to come out of their resting place within the enclosure. Even if they do, extra enthusiastic visitors scare them back in by screaming and shouting. Going up from the Mall road right up to the zoo entrance is also a pretty steep, treacherous and exhausting climb. Make sure you take a shared taxi for this (Rs 40 per ticket). All in all, the zoo, while good, isn't too great and can be given a miss.

There are state run cabs there to run from Shimla station road to take you there. Your own car cab can also take you there and drop you before 200 meters from the ticket counter.

0900 - 1700

50 Rs for Adults and 20 Rs for Children.Still Camera 25 Rs and Video Camera 200 Rs.