UNDATED -- A state organization is making it easier for you to get out and enjoy some fresh air this week.

The Minnesota Department of Natural Resources is waiving entrance fees all day Friday for all 75 state parks and recreation areas. Each year four free park days are offered including one during each season.

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The DNR says most park offices and visitor centers will be closed or have limited staff, so plan ahead. They also ask that if you visit one of the parks you stay on the trails and leave no trace.

RANKED: Here are the most popular national parks

To determine the most popular national parks in the United States, Stacker compiled data from the National Park Service on the number of recreational visits each site had in 2020. Keep reading to discover the 50 most popular national parks in the United States, in reverse order from #50 to #1. And be sure to check with individuals parks before you visit to find out about ongoing, pandemic-related safety precautions at www.nps.gov/coronavirus.

READ ON: See the States Where People Live the Longest

Stacker used data from the 2020 County Health Rankings to rank every state's average life expectancy from lowest to highest. The 2020 County Health Rankings values were calculated using mortality counts from the 2016-2018 National Center for Health Statistics. The U.S. Census 2019 American Community Survey and America's Health Rankings Senior Report 2019 data were also used to provide demographics on the senior population of each state and the state's rank on senior health care, respectively.

Read on to learn the average life expectancy in each state.