Rates vary from place to place but not significantly, unless you try to change money at a hotel which charges high commission. Travelers' checks are changed at a slightly lower rate than cash. The cheaper hotels and restaurants don't add taxes. Tipping is not expected in budget restaurants. Taxi drivers are not tipped - bargain hard beforehand and stick to your price.
Bargaining is a way of life in markets.
We encourage you to verify any critical information with the relevant authorities before you travel. This includes information on visa requirements, health and safety, customs, and transportation.