Went back to Island Park today 1/25 landed numerous 10 inch trout, one 2.5 lb Rainbow, and a sweet 3 lb 17 inch Kokanee. If you want to travel anywhere on the lake I would say a snowmobile is a good idea. The ice is weird, not much of an expert but lots of layers of slush and clear ice. Makes me a little nervous, but we measured it by the dam and it was about 2 ft. There is still a fair amount of slush standing on top of the ice, so make sure your boots can handle the water. The slush has been capped with a two inch frozen layer that you brake through while walking, I try to walk in any snowmobile tracks because they are frozen solid. On top of that frozen layer is a good 10 inches of snow. Snowshoes would be sweet. Also like I said the ice makes me nervous because I used a 8" hand auger and I could pound out a hole in under 45 sec. But fished all day and had no problems. Snowmobiles were crossing it all day also.