A decline in the moose population at Isle Royale National Park, along with inbreeding, are being blamed for the loss of two of the island's four wolf packs. Where once the island's wolf population had numbered more than 50 individuals, by the close of 2009 there were fewer than 20, researchers say.

There was a paper that zoomed around cyberspace a couple weeks ago, one that roamed far and wide, not unlike a young wolf seeking a territory of its own. It gathered speed as it was flicked around the Twittersphere because it focused on two subjects that captivate more than a few people -- national parks, and wolves.

For most, a national park vacation entails booking a room in a lodge or reserving a spot in a campground, arriving at the park and checking in, and then spending a number of days hiking, paddling, or traveling the park to view various sites, whether they focus on waterfalls, geysers, deep forests, museums, or cultural focal points. Here are some alternatives to that approach, some pricey, some not so.