I have been to nanital twice on a football competitions held in st. Josephs school. The place is too good. To start with the view you will see on the nani lake early morning is fantastic.
Jim corbett is only 60 km from nanital so u can pay a visit there and enjoy the fauna and flora. Activities like para gliding, bunjy jumping etc. Are organised by many organisation and its wonderful. So do try them.
Then comes a famous temple called nanda devi temple. The hotels are easily available and it would be best if you drive your own car there. Other places like ramgarh etc. Are close by.
Pay it a visit .