A lot of the outdoor stores sell something called "trail shoes" - a cross between a hiking boot and tennis shoes. They are lightweight like tennis shoes but have better soles and traction for walking on uneven terrain. I bought a pair last year for hiking over lava flows in Volcano National Park in Hawaii (tennis shoes were not recommended). I've worn them a lot since and I am looking for another pair to take on our August AK cruise. I highly recommend them if you want to tavel light and bring one pair of shoes that are comfortable, durable and will serve many purposes.