Rent a car: From Bergen, you can rent a car and drive to the national park. The drive takes about 2-3 hours, depending on traffic and road conditions.
Take public transportation: You can also take a combination of buses and ferries to reach the national park. From Bergen, take the bus to Rosendal, then take a ferry across the Hardangerfjord to Sundal. From Sundal, you can take a shuttle or taxi to the national park.
Once you arrive at the national park, you can explore the glacier and surrounding areas on foot or by skiing or snowboarding in the winter. There are also guided tours available for those who want to learn more about the area and its history.