In Juneau, renting a car is an excellent means of transportation to get you around the city, but most of the major attractions are close by, and it's easy to use a taxi service. The estimated travel cost for the day is $50 if you rent a car, or it can vary depending on the mode of transportation you choose.
If you have more time to spare, consider a visit to the Glacier Bay National Park, the Shrine of St. Therese, and the Last Chance Mining Museum. Suppose you have less time, skip the Alaska State Museum and save money on the tram ride by opting for a hike in the nearby trails instead.