Most cameras are portable and at least somewhat ideal for travel. But, no other type may be better for it than action cameras. They are almost made for travel enthusiasts as they are typically extremely portable but also built rugged enough to handle abuse and accidents. In addition to this, they are also designed to be head-on in all the action. They are digital cameras, for the record, but they are not optimized for still shots and such. And, when traveling, they can capture any intense action that you want to record such as extreme sports.