All Kansas state parks are waiving entrance fees on Friday.

This is part of the #OptOut initiative going on across the country, to encourage families to spend time outside. REI is a driving force behind this effort, which started with the closing of its stores in 2015, to give people time to get out.

“In the middle of everything, we have watched as people all over the world, some for the first time, looked to time outdoors to reflect, restore and connect with one another,” said Eric Artz, REI president and CEO. “We are focusing on what matters most.”

Kansas State Parks director Linda Lanterman said attendance at parks has been exceptionally high.

“We’re really proud that people could turn to Kansas state parks for hiking, cycling, camping, fishing and safely relaxing with loved ones out-of-doors,” said Lanterman. “Hopefully, #OptOutside will be a continuation of all of that with thousands taking advantage of what we have to offer, and at no cost.”

If you are heading out to a park on Friday, there is a chance to win a nights stay at any state park cabin in Kansas. To enter, visitors must simply take a selfie within the park and share it on Twitter, Facebook or Instagram with the tags #OptOutside and #MyKsStatePark.