Traveling to Alaska is much less difficult than you might think. Simply fly into Anchorage, rent a car or take a commuter flight to the town of Kenai, and rent a car from there.
The drive from Anchorage to the town of Soldotna (mid-point Kenai River) is 150 miles and takes approximately 2.5-3 hours. The drive is very straightforward and travels the beautiful Seward Highway, which meanders through some spectacular scenery including the Turnagain Arm mudflats, Chugach mountain passes, Kenai River headwaters, and eventually the boreal forest and coastline of the lower Kenai River.