How Much Will Being a Tourist Cost?

Why?

You are planning on taking an active vacation by visiting a foreign city and touring its sights. How much will it cost per day?

How?

An app that lets you choose a city, the activity level (how many museums, sites, etc. you would like to visit per day), eating habits (how many hot meals, etc.), and where will you stay (to calculate travel expenses), and gives you a from-to list of expense possibilities for each item.