Actually they will drop bus at around 30km from Nainital because due to hilly areas buses are not able to go there..so bus agency will have a facility of Jeep/Bolero with the help of those they will drop at Nainital
I visited Nainital...I can suggest u best places to visit near Nainital so if any query related to it u can drop me message i will surely reply..!!!
Happy Journey