We are traveling around the South island for the first couple of weeks of May. We will be travelling from Christchurch down the Coast to Dunedin, across to Inercargill then up to Mt Cook/Tekapo region. Will we be ok to book our accommodation as we go or at will we need to book ahead for certain regions. Is it likely that we will need to book the Glacier boat trip ahead of time or at that time of the year should we be able to organize it on the day or a day ahead? Thanks for your time. PS we hve previously 'done' the West coast, Queenstown and Christchurch hence the focus on the South East part of the Island.