Documenting here: bought my Dad a book on hiking Kilimanjaro. I've decided we're going in 2008, but we'll see. I'm not used to planning too far ahead, but I think it might be helpful to set goals like that. It requires some conditioning (nothing like what unreasonable is up to), but shouldn't be hard for my old dad.
At 19,340 ft, Kilimanjaro is Africa's highest mountain and the world's tallest freestanding peak. The fact that it's possible to walk to the summit (no mountaineering skills needed) has made this Africa's most popular trek. Kilimanjaro is not difficult to reach and even has its own international airport. It's ideally placed between Tanzania and Kenya and most walkers combine the mountain hike with a visit to a game park.