Singapore is a global hub for education, entertainment, finance, healthcare, human capital, innovation, logistics, manufacturing, technology, tourism, trade and transport. The education system in Singapore has been noted to be one of the best in the world. Singapore promotes itself as a medical tourism hub, with about 200,000 foreigners seeking medical care there each year. In the city, there is no need for a car. Public transportation is excellent and walking is a good way to explore the city . All major attractions are also accessible by tour bus. Since the city is only 60 miles (100k) from the equator, the tropical temperatures do not vary much. Rainfall is fairly evenly distributed through the year. No matter when you choose to visit, warm weather will be abundantly available. The visitor is struck immediately by Singapore's abundance of parks, nature reserves, and lush, tropical greenery.