Ensure you extend your visa at least three days before it is due to expire. Changing money on the streets is illegal. Visitors should be aware that some policement may be bogus and they should not hand over identification documents or money but should go with them to a police station. The risk to tourists is not considered great. Some tourist attractions charge visitors who wish to take photographs.
Dress tends to be quite conservative but casual clothes are usually suitable.
Your Passport to Safer Travel gives practical tips and advice for travelling independently around the world - safely.