Lone Butte stands right in the middle of the diamond shape formed by Rainier, St. Helens, Adams and Hood. As such it afford excellent views of each of them in all directions as well as part of the Columbia Gorge. It's an easy summit in summer as you can drive to a spot near the summit and walk up through the forest and rock (there's no trail though) but it really makes for a great winter summit when you can't get to the big Cascade peaks.
The mountain has a neat geologic history as it was formed by an eruption that occurred under either glacial ice or a meltwater lake. This kind of volcano is called a "tuya". The lower part of the mountain is composed of pillow basalt that forms when it erupts under water and appears lumpy. On a winter ascent when snow-covered this is greatly accented. The top 200 feet of the mountain are where the basalt core rises through the trees. There are also neat lava dikes on the northeastern side of the mountain.
At the part of the hike where the road/trail ends there is an old quarry site on the southwestern part of the mountain where you can see the various strata easily. If you hike around the west side of the mountain there is a large snowfield in winter that looks like it would make a neat steep snowclimb although the easier way to the summit is around the southern side of the quarry.
Not many people make a winter ascent and it makes for a neat day of cross country skiing or snowshoeing. Depending on conditions, an ice axe and crampons might be warranted as well. The only problem in the winter is the sound of snowmobiles on the trails below. But, in winter you get an approach from the snow park of 3 miles. The top 600 or so feet of elevation gain would require skins on skis though.
All in all, this is a fun mountain with great views and some neat sites along the trail.