Naukuchiyatal is again a lake place. It has a famous temple. You can just go have some cold coffee at the lake side cafes and rest for sometime. You can move from there in an hour for Bhimtal. Try taking the same cab to hotel as getting other cabs at that time might get difficult.
You can also try going to Nainital the next day but there is nothing so special as its always very crowded. Though a visit will not harm.