Is Snorkeling for Everyone?

Almost anyone can learn to snorkel. Its proximity to the surface of the water and essentially non-strenuous nature mean that it is suitable and safe for nearly everyone.

Do I need to be a good swimmer in order to snorkel?

No, you do not need to be an advanced swimmer, but it is important to be comfortable with being in the water before you snorkel. Floating face-down should be an easy task and you should not feel panic if the need for coming up for air arises. Diving masks may let in small amounts of water through the seal, and if there is excessive splashing or if you tilt your head too low, snorkeling tubes may fill up with water. While it is easy enough to clear the tube by exhaling sharply or by returning above the surface and releasing the water, it is important for you to be able to handle these situations without panicking.

I wear glasses/contact lenses, can I still go snorkeling?

Yes. If you wear contact lenses, you can easily continue to wear these along with your diving mask while snorkeling. While there is a chance of water entering the mask and washing out your lenses, it is unlikely.

Avoid wearing glasses under your mask even if there seems to be enough space. While there are snorkelers who do this, the probability of your glasses shifting and causing discomfort is high, and the smallest leak of water inside your mask can add to this. A pair of disposable contact lenses is usually a more comfortable option. Alternatively, you may want to invest in a prescription snorkel mask.

In some cases, as this detailed piece on vision under water explains, the combination of a regular, non-corrective mask and the water itself may do the trick, so do make sure you really need it before purchasing any prescription mask.

Source: https://www.jenreviews.com/snorkeling/