What are the key features and benefits of the Olympus Tough TG-4 digital camera, and how can it enhance your outdoor photography experience? How does the camera's 16-megapixel CMOS sensor and fast f/2.0 lens allow for high-quality image capture, even in low light conditions? What shooting modes and features are available on the camera, such as underwater, macro, and time-lapse modes, and how can they be used to capture unique and creative images? How does the camera's rugged, waterproof design and built-in GPS and Wi-Fi connectivity allow for easy use in challenging outdoor environments, and seamless sharing of your photos and videos with friends and family? What kind of memory cards can be used with the camera, and what is the maximum storage capacity? How long does the rechargeable lithium-ion battery last, and is it easy to replace? What accessories are available for the camera, such as underwater housings and mounting systems, and how can they expand the camera's capabilities for different outdoor activities? What is the price range for the Olympus Tough TG-4, and how does it compare to other cameras in its class?