No on the Snorkel thing. The pressure increases around your body the deeper you go. That's why people feel pressure in their head when they dive down into the deep part of a pool. So...there is much more pressure pushing on your chest from the water around it if you were 6' deep that you'd actually have to 'suck' the air and use as much negative pressure, to get the air, as the pressure surrounding you. Most snorkels stick about 8" above your head when face down moving along. One can even tell when they are going deeper, like inches, as the air gets harder to breathe from the snorkel the deeper you go.
IMHO, the SCUBA thing is not a macho thing. Many petite females are excellent certified divers. They just have to figure a way to get their gear to and from the beach but once it's on and they are in the water, they do fine as the weight is not as much an issue when in the water. The SCUBA shops are in the business of encouraging people to dive, and buy gear from them, and I can't remember when I've seen anyone who wanted to pass a class...fail. I worked as a pool instructor and an open water dive instructor. There were times when the teacher of the class would give extra lessons to students who were having trouble long after the official class was over. My experience was the book learning part of the course is a lot more intimidating than the skills and that's what caused the most problems.
Now if you complete that class and know how to be safe you can get a SCUBA tank and float it above you in a tube or something, and use a long hose and work 6-8'. But, if you haven't had the training, panic, and shoot towards the surface holding your breath, which you might do if you were having an air problem and were panicky, you'll probably experience an spontaneous pneumothorax. In short you will rupture some blood vessels inside your lungs and pink frothy blood will be coming out your mouth. Definitely a potentially lethal medical situation.
Go for it! If you don't already have an UNDER-water detector you'll have to get one. Unless you are in the tropics you'll need a wet or dry suit. For what you are doing you can get used re-conditioned tanks and regulators reasonably priced. You don't need the $1000 top of the line mixed gas regulator as you will be working shallow. If the equipment has been rebuilt by a qualified technician, and most dive shops have them, it'll do you fine. jim