What are good restaurant related questions that I can ask in a survey for the purpose of exemplifying the market to investors?

Ask more questions to yourself. In their books on positioning, Jack Trout and Al Ries indicate that people do not give accurate answers to survey questions.
Find an avatar, such as a TV character that might eat at your restaurant and ask yourself what would they do? What would their response be to this restaurant idea?
Bottom line ask how you will make money. Investors invest to make money.
Don't stop taking massive action.
Best of Luck,
Michael T. Irvin
michaelirvin.net
My books are available exclusively through Amazon Books. Check out my book "Copywriting Blackbook of Secrets"
Copywriting, Startups, Internet Entrepreneur, Online Marketing, Making Money

The questions you are asking are insightful, but just based in theory. People visit restaurants for good food and good service. Regardless of what the theme or food type is, it has to be able to deliver good food with good service in a pleasurable atmosphere.
I don't know what the vacation question has to do with the restaurant.
Of course, all restauranteurs would like to franchise their idea and get a steady income stream. However, the restaurant must first prove it is a financial success, enough so that other people will pay you to replicate it (and in return you provide them support). WIthout even a solid concept yet, there is a long way to go before you can even dream of franchising.
I'd love to discuss this further with you.

Here are some good questions to ask in a survey. You can have them provide short answers or choose a rating, depending on the question:

* What did you like best about our services?
* What did you not like about our services?
* What, if anything, has changed about our services since your last visit?
* How would you rate the staff’s ability to meet your needs?
* How would you rate the staff’s willingness to ensure your needs were met?
* How would you rate the staff’s ability to work together to meet your needs?

You can see more questions in this blog from Fieldboom: http://www.fieldboom.com/blog/customer-service-surveys/.

My question would be who you are targeting your surveys towards. Are you giving the same content in surveys for the tourists and locals. In which case, if the commerce is heavily driven by tourism, you are likely to get much different answers. Local communities in tourism areas tend to want places they call home, exclusive to the community. The target segment for your survey should help curate the content of your survey. You may be better served with a different version for each, or if the survey is digital, make the end points vary for questions asked that would supply the survey takers demographics.