Alaska is home to some of the most beautiful and remote national parks in the United States. An Alaska cruise is the perfect way to visit these parks and experience the natural beauty of the state. Some of the most popular national parks that can be visited on an Alaska cruise include:

Glacier Bay National Park:
This park is known for its glaciers and calving icebergs. Visitors can take a cruise or a tour boat to see the glaciers and wildlife, such as whales, seals, and sea otters.

Kenai Fjords National Park:
This park is home to the Harding Icefield, one of the largest ice fields in the country. Visitors can take a cruise or a tour boat to see the glaciers and wildlife, such as sea otters, sea lions, and puffins.

Wrangell-St. Elias National Park:
This is the largest national park in the country, and it's home to the highest peaks in North America. Visitors can take a cruise or a tour boat to see the glaciers, wildlife, and historic mining towns.

Kodiak National Wildlife Refuge:
This park is known for its Kodiak brown bears, which are the largest bears in the world. Visitors can take a cruise or a tour boat to see the bears and other wildlife, such as sea otters, sea lions, and eagles.

Tongass National Forest:
This is the largest national forest in the country and it's home to many species of wildlife such as black bears, wolves, and Sitka black-tailed deer. Visitors can take a cruise or a tour boat to explore the forest and see the wildlife.

All these National Parks in Alaska offer spectacular natural beauty and a chance to see diverse wildlife in their natural habitat. It's important to note that many of these parks are remote and rugged and many areas can only be accessed by boat or on foot. An Alaska cruise is a great way to see these parks, but visitors should be aware that weather and sea conditions can change quickly, so it's important to be prepared for any eventuality.