Roger that--that's a good site. Here are some other places to find good Alaskan info:
http://www.strisik.com/alaska/index.htm
http://www.alaskastateparks.org/
http://www.dnr.state.ak.us/parks/aktrails/index.htm (here's your big one for trails)
http://www.alaska.com/ (run by the Anchorage Daily News)
http://www.alaska.org/ (run by the Alaska Channel, a pseudo-non-profit organization running a TV channel shown in many Alaskan hotel rooms--I've found it to have good info written/recommended by locals. It claims to be ad-free and unbiased--regardless of whether it is, it's a well-designed site with quality recommendations and info)
http://www.anchorage.net/ (Anchorage Convention and Visitor's Bureau)
http://www.themilepost.com/ (The Milepost is the best book for traveling by road in Alaska--but it's half the price at the Anchorage Costcos and slightly more at the Anchorage Wal*Marts)
http://www.arh.noaa.gov/ (the Alaska regional office of the NWS. Use to check the extended forecast for your time here. Click the map for the area forecast. Be aware that many of the clickable areas are the size of small states on the east coast. Also, check out the better-laid-out Anchorage forecast office's site at http://pafc.arh.noaa.gov/)

Shortly after departing the McKinley Princess Lodge, I did run across a few trailheads, one of which is somewhat within walking distance of the lodge. Google "Lower Troublesome Creek" or look it up on the trails page I linked above. It's a short trail (.5 miles) but it's at least something. There is a 12-mile Troublesome Creek trail, but I didn't notice any specific trailhead from the highway. Perhaps it's linked to the Lower Troublesome Creek trail--again, check online for those words. As far as finding them, the Princess is at Milepost 133 on the Parks Highway. I'm sure the Trails page will give a milepost for the other trails, and you can judge whether it's within walking distance. I'd say that it's fairly safe to walk along the Parks (the shoulders are wide), assuming you don't run across any drunk drivers veering off the road.

Also near the hotel is the Era helicopter flightseeing base. I'm not sure that it's within walking distance, but I'm sure they have a shuttle service. Check http://www.fly-era.com for more info on that--just be sure to look into their helicopter service, not their fixed-wing flightseeing or commuter airline service, as those are both based in Anchorage.

Last, three guidebook series I'd recommend at least thumbing through at a bookstore before traveling anywhere (including Alaska) are Let's Go, Lonely Planet, and Rick Steves. They cut through the junk to give you a fairly authentic picture of the destination, even if they do tend toward the budget side of things (which, in my case, is a good thing).

If you need further assistance deciphering the locations on any of the sites, feel free to post back here and I'll try to help!