There are tons of Taxis around and they are very cheap.
Currency And having Currency While in TIJUANA You will be able to exchange your money at the airport or at any of the banks around the city once you arrive. Many of the nice restaurants and hotels will also accept the US dollar as well, but we recommend that you just use the Colombian currency during your visit. The most common way to obtain cash in Cartagena is through the ATM machines, and you can find these all over the place. Also credit cards are easy to use and most restaurants, stores, and hotels will readily accept Visa, MasterCard, or Amex. If you are using a credit card however, never allow anyone to walk away with your card. In the USA might be used to handing your credit card to the waiter and letting them run it without you watching, but in Colombia you should always have an eye on your credit card and make nothing funny is going on. So make sure they do all transactions in front of you.
Resort rooms Inside the MEDELLIN There are many hotels in Cartagena, and the prices vary depending on what time of year you travel there. If you go during peak season (December or January) the average price for a hotel is around $300, and even a low quality 1 star hotel will be $100 or more during the peak season. If you go during the off peak season the average price comes down to around $150, and there are many decent places where you can stay for around $70 per night. As far as the best places to stay in Cartagena, well Bocagrade is the highest class area, and many people like to stay there. They have several high end hotels like Hotel Caribe and the Hilton. Also you will find that many people rent out nice apartments as well. Another nice area to stay is inside the walled city in old downtown Cartagena. Here you will find many options if you go to any of the hotel sites, however there are fewer apartments for rent inside the walled city. In either of these two places you will be close to most of the action and you will be safe as they have lots of police around.