Yes, one can hike, bicycle and kayak in every single state in the nation. Obviously there are outdoor activities to be had in Texas, but compared to other states I don't think Texas would be ranked as remarkable, not above average. Comparatively, Idaho is known to have some of the best mountain and park areas in the country for fishing, camping, hiking, kayaking, skiing, and practically all things outdoors. And compared to other states in the Northwest, Idaho is still very cheap while it has similar or better offerings. I'm glad you like Austin and Texas so much, but there is no way it compares to Idaho when it comes to outdoors, just like Boise does not compare to Austin when it comes to nightlife. Just because one or the other is better it's not like either place is completely lacking in either outdoor activity or nightlife. Weighing it all out, I enthusiastically recommend Boise.