The noun snorkeling is a verbal noun (gerund) which are normally considered non count (mass) nouns.
Rather than attempting a clumsy plural like 'snorkelings', you should use the present participle adjective, for example, 'snorkeling sessions' or 'snorkeling dives', etc.
No.
They were developed separately.
Snorkelling
Fins.
Tourists go snorkelling.
Endangered Sea Turtles!
yes, it is done at the great barrier reef.
Snorkeling is correct. ^^^^^ No it's not. It can be spelt either "Snorkelling" (which is how i spell it) and it is indeed the British way to spell it. Snorkeling is the US way of spelling it. No way is right or wrong, it is a personal opinion.
There is a lot. It is easily seen snorkelling around Soufriere.
It is held in Wales, every August.
The correct phrasing would be "I am going snorkeling" or "I am going snorkelling," depending on the variant of English being used (American English vs. British English). The gerund form "snorkeling" or "snorkelling" is used to indicate the activity of engaging in the water sport of snorkeling. The phrase "I am going to snorkel" is less commonly used and may imply a future action rather than the immediate activity.
There are several places that offer snorkelling holidays, including the island of Sardinia, the city of Destin in Florida, and islands in the South Pacific. To book a holiday for two, a visit to each area's tourist website will provide the necessary information.