Some Hints:

• The best reviews give a clear sense of why you liked or disliked a restaurant, bar, or store. And that means details. Mention specifics dishes, type of crowd, pros and cons...
• If it's helpful to compare one place to another, go for it.
• Come up with clever, funny, pithy subject lines, and write in the first person.
• Don't forget to read the user rating guidelines and rules.