I really love this app... Especially when traveling. It has been a life-saver on several occasions and is also just fun to look at and read.
My two suggestions are as follows:
Allow users to edit or delete their own posted reviews after posting. I have accidentally given places the wrong "star" rating and have no way of deleting or changing the review.
Make it easier for users to add locations. While the app list is quite extensive, there are so many great places missing!
Teknotribes about HappyCow - Vegan Food Near You, v1.21