Start off your trip by visiting one of the world's most famous beaches, Copacabana Beach. This 4km stretch of sand is perfect for a morning stroll and a dip in the ocean. The beachside promenade is lined with bars, restaurants, and street vendors selling local delicacies. Make sure to check out the iconic Copacabana Palace Hotel which has hosted many celebrities over the years.
If you have more time, consider visiting other famous landmarks such as the Maracanã Stadium or the Tijuca National Park for a hike in the rainforest. If you have less time, you can skip the Lapa Steps or the Municipal Theatre of Rio de Janeiro. Make sure to bring sunscreen, a hat, and a bottle of water as the sun can be strong in Rio de Janeiro. It's also recommended to carry a small amount of cash as some restaurants and vendors do not accept credit cards. Finally, be aware of your surroundings and avoid flashing your valuables in public areas.