Snorkeling (or snorkelling) is the practice of swimming on or through a body of water while equipped with a diving mask, a shaped breathing tube called a snorkel, and usually swimfins. Snorkeling is a popular recreational activity, particularly at tropical resort locations. Snorkeling is also used by scuba divers when on the surface, in underwater sports and as part of water-based searches conducted by search and rescue teams.

Based on the definition found on Wikipedia:

Other Activities we achieved

Have a look at the other activities we ‘achievied’ to do as well as other types of Achievies