On the other hand?

[jose rocha]

One of the most important things to remember when you go to Rio de Janeiro is not to take a large sum of money in the purse or wallet. You should leave the money in the hotel safe or with your houseguest.
On the other hand, there are a lot of places to visit: beautiful beaches, churches and famous landmarks.

Question - When do we use "on the other hand"? Did I use it here correctly?

[Tdol]

It is OK. It might be better if were had more information, like a conclusion about the crime:

Rio has a high crime rate. On the other hand, there are a lot....

[mykwyner]

I used to have a writing professor who would give me a hard time if I said "on the other hand" without first saying "on the one hand" in a previous, comparative statement.

On the one hand Rio is dangerous... On the other hand it is fun...