I currently have two 14 foot sea kayaks and enjoy river and lake tours. I just took my first whitewater kayaking class and enjoyed it very much. I’d like to do full day kayak trips that have up to class 3 maybe 4 rapids. I am not interested in competition right now. What type of kayak would you suggest for this type of use?
Still much that depends - particularly type of river you are on. Most likely will be a river runner type boat.
To get to class IV takes a lot of experience, which can be sped up by taking classes. Assuming the classes are in a place where you would be paddling (so same type of river), ask them for recommendations on types of boats to use. They would have a good feel for what is right for those rivers.