Denver's public transportation options have come a long way over the past few decades, but they still have a long way to go, too. There is a decent and affordable light rail system, including a line that runs all the way to the airport, but you'll need to be staying near a station to get the most use out of it. The bus system is fine and reasonably extensive, but you may have to make several transfers to reach your final destination. Most people who live and work in Denver own and drive cars, and Denver is a city in which a rental car will be a huge help to you. Parking is affordable or free all over the city, and you won't have any trouble finding a parking spot in most areas. Alternatively, if you don't wish to drive in a strange city, there are plenty of ride-share drivers waiting around to pick you up. Downtown Denver is pretty walkable, so depending on what you wish to see and do, you may not need a car. But, if you're planning to explore the entire city and maybe even head into the mountains for an adventure, having access to a vehicle will be a big help to you.