Alaska ain’t cheap, as any “sourdough” (old-timer) will tell you. The cost of flying and shipping everything to such an isolated region is invariably passed on to the consumer. But if you’re willing to forsake flightseeing for hiking and national museums for national parks, you’re halfway to experiencing the US’s largest state on a shoestring. The majority of Alaska’s national parks are free to enter © Rick Saez / Getty Images National parks In contrast to many national parks in the Lower 48, seven of Alaska’s eight parks and preserves don’t charge entrance fees. All of Wrangell-St Elias (a park the size of Switzerland) is free to roam at no cost. The full eight million acres of Gates of the Arctic can be enjoyed for nothing. The only Alaskan national park where you do have to dip into your wallet is Denali which charges an affordable $15 (valid for seven…