We do study the deck plan and choose the cabin of our choice.
We usually go on the smaller ships so it doesn't take me all day to find lunch etc...
We do a little research for the ports but not too much ...I just find by the time I get there I am exhausted from all the planning!!
We have a friend who plans everything down to the minute (well almost) they are on the go all vacation. Not my kind of vacation, been there, done that.
Now we go with the flow.
Everyone has there own way of spending there vacation time.