Wear whatever is comfortable. It is recommended to have a sturdy pair of broken-in trail shoes, boots, or sneakers. It is preferable to dress in layers and wear clothing that will wick away perspiration and keep you dry and comfortable
Not much, we do not recommend carrying any loose objects such as cell phones, cameras, water bottle or any objects that will not leave your hands free while the activities.
However you can carry a SMALL backpack with such objects you consider necessary.