Last day in Te Anau

Decided on a rest day today in the end. Wanted to go to Doubtful Sound but couldn't get on a trip and the weather turns until Thursday now. So do I wait or not? You can't reach the sound by car or I would have driven there myself. If you do the trip it's a boat trip and then a trip by road to get there before you do the tour of the sound. In fact in a nine hour day only two hours are spent on the sound itself. But a part of me  would still  like to go. The trip is a hundred and twenty  five pounds by the way! Will decide later. If not it's  down to Invercargil and on to Stewart Island.
Glen x