I have some good suggestions about what you have written.
One of my biggest dreams is to conquer ( you could write that, if you were a sailor and wanted to conquer huge waves or the oceans, but I think you aren't!) so it has to be cruise the ocean with a wonderful cruise ship ( you are on vacations, aren't you?) and let go of all the burdens and worries and of course enjoy the view - will it become true?
And no, you cannot use BY a cruise ship, because the use of by indicates passive voice- for example , the oceans will be conquered by me .
Hope I hane been helpful,
Student or Learner