It depends on the type of trip you plan to undertake in Kerala. If you are looking for a hill station/sight seeing trip, then you can plan something covering Munnar -Thekkady - Idukki. For this you can keep Vagamon as your base and then travel across to visit he places Incase you are looking for a beach experience, you can go to Kochi- Munroe Island - Kumarakom - Allepey - Varkala Beach - Kovalam Beach etc