I want to be able to see the countryside, experience the culture and also take a bit of yoga. Never been to india, have no idea where to focus on. can someone suggest something.

What time of year, how long do you have for the trip. These would be major factors to me in providing advice on where to go.

Jookie, in India keep yourself unfocused. You don't have to go looking for culture there. Culture will find you. The first wave of culture will hit you as soon as you step out of the airport (i.e. if the biryani in Air India doesn't wreck you first)

True.Do not psyche yourself about India.Dont also go with high expectations.Culture is everywhere.Learn to imbibe,get to mingle,read up more,you'll simply love the place.
A word of caution about yoga.It takes a long time to learn the "asanas" & the "pranayamas".A renowned yoga exponent is a must when you intend to learn.If yoga is practiced or taught the wrong way,it could do more harm than good.One of the best yoga masters that come to my mind is Yogacharya BKS Iyengar of the Ramamani Iyengar Memorial Yoga Institute, Pune.This is the site:http://www.iynaus.org/News/Announcements/national.aspx
Of late its been a fad & there are many charlatans running so called 'Yoga institutes',of which one must be careful about.
Need more details about your plans before we can advice.

thanks guys...i have decided on kerala for 9-14 days in April. Where should i start? I may have to past on yoga since i wont be able to focus too much on it with all the sights. may be too much to take in on such a short trip.