I use an older
Casio Exlim EX-S600 it does the job I bought it for. I wear it on a lanyard around my neck for quick grabs for photo ops. It can be operated one handed pretty easily. I like it because it will fit in a shirt pocket. It is not as weather proof as I would like, but I haven't had any issues with it yet. For something like a tour I would want a camera with a replaceable battery, preferably something that uses AA or AAA.
Aaron