You got some good advice so far. I'd like to add (somewhat tongue in cheek); Ask not what you will get from your survey, but, what you will add to your survey.
1. Show up early.
2. Have a flashlight, digital camera, paper, pencil, etc.
3. Expect to get hot, sweaty, down and dirty.
4. Prepare to fill water tanks, run power cords, hold a flashlight, help bend sails, flip a switch, whatever.
5. Ask questions. Lots of questions.
If you are really motivated, use information available to conduct your own survey first and have any questions you have come up with ready for the expert. Boat Inspection Trip Tips
Find a surveyor who will let you buy them out early for less $$ if they find a major issue.
If the broker takes issue with the survey results, laugh in his face.
Be prepared to walk away.
Don't ever fall in love with something that can't love you back.