According to your plans if you have booked a whale watch activity your guide will take you in time for your check in or if no activity planned then your driver/guide will show you the seal colony that resides on Kaikoura's coastline. Choice of whale watching by boat or by aircraft specially designed with wings above the windows so as not to obstruct viewing(ensure you have pre booked as this activity is very popular).
If you are not staying the night in Kaikoura you will be taken to 2 wineries to do some tasting on your return journey to Christchurch. If you are staying in Kaikoura your driver/guide will transfer you to your accommodation.