Best camera option for camping and scuba diving?

I'm getting ready for a camping trip to the Amazon Rainforest and later to a Scuba Diving marathon in Santa Marta, Colombia. I currently use a Canon T3i DSLR camera as my main camera, but because of its size and sheer fragility I have opted not to take it with me.

Originally I was planning to buy a waterproof case for my iPhone as it was the cheapest option, but this wouldn't allow me to take pictures while Scuba diving.

I'm an amateur photographer, but I do like quality and so I was thinking about buying a GoPro Hero 3+, but after reading reviews it was obvious the audio quality was is not very good at all. I'm now thinking of buying a Canon G16 camera which would allow me to have more control on the overall camera, as well as being able to Scuba dive with it if I bought the Canon Waterproof Case WP-DC52. The downside of this camera is that I can't seem to find a suitable case for it to be protected while I'm in the Amazon.

Please I would like for this community to suggest any cameras and/or gear for the things I already have so that I can take great pictures of my trip!

I think you are wise to leave the T3i at home, most likely it wouldn't survive.

Maybe your best bet is one of the waterproof cameras. Most companies make at least one model, and Olympus has several in its tough series. Here is a list of the ones that Popular Photography featured in their April edition.
Popular Photography - April 2013
Sony Cyber-shot TF1 - $198 (need reviews)
Fujifilm FinePix XP60 - $198
Pentax WG-3 GPS - $297
Nikon Coolpix AW110 - $347
Olympus Stylus TG-2 - $379
Panasonic Lumix TS5 - $399

This guy reviews some, also