I really don't see the problem with the term snorkeling?!?! It seems to me to be a fine term that best illustrates the activity associated with it. Instead, maybe people should stop being so concerned about whether or not they'll be thought of as "cool". If you can't seem to get around that, then find a spokesperson that will make snorkeling a "cool" activity, (which, by the way, I enjoy snorkeling a lot and have never felt ashamed to say I'm going snorkeling). If a term such as "redneck", one historically associated with less than desirable attributes can somehow be made fashionable (I'm still baffled by why anyone would be proud of being a redneck, but that's a different debate) by the right spokesperson, I see no reason why snorkeling, a fun, family friendly, easy to do, and all-around great activity, can't be made fashionable.
I agree with you that snorkelling doesn't have to be "cool". On a swimming forum once I was informed by a poster, who was probably a teenager, that he always shaved off his chest hair because desirable females thought it was "cool" for young males to do so. Too much information, I thought at the time, and I was left with a determination to remain pectorally hirsute.
However, I don't think snorkelling should ever be regarded merely as an entry-level activity leading to "something better", such as scuba diving or freediving. Furthermore, and sadly, certain contributions so far to this thread appear to show a degree of contempt for snorkelling, barely disguised as "banter". Snorkelling is indeed "a fun, family friendly, easy to do, and all-around great activity". I've enjoyed the pursuit immensely for half a century. While it's my choice not to scuba-dive, I admire those who do and I sense and understand their passion for the activity. All that's needed is for divers to respect others' choice of a different water-based activity.
Recently, there's been an upsurge of TV-promoted interest, and participation, in open water swimming, at least here in the UK. Lake and river swimming has been popular in Germany for several decades, but here in England swimming in inland bodies of water as well as in the sea has been beset on one side by competition with anglers and other "water users", and on the other side by the health and safety lobby which regards swimming outside indoor pools as dangerous folly. I wonder whether snorkellers could make more common cause with open water swimmers, some of whom, for example, use diving wetsuits for distance swimming. There's been a similar upsurge of interest in "swimhiking", combining cross-country walking with swimming in rivers and lakes. There's a great book by Geoffrey Fraser Dutton called "Swimming Free: On and below the Surface of Lake, River and Sea", published in 1972. The dust cover has the following blurb:
"Though practical in approach,
Swimming Free is not an instructional manual. It is one man's personal history of his encounters with untamed open water and his growing awareness of the unique delights of "adventure swimming". It is likely to become the classical introduction to an open-air recreation whose immense possibilities are just beginning to be realised. Every swimmer - or swimmer-to-be or simply lover of wild water - should read it"
Note the image of the author on the front cover of his book, wearing wetsuit, snorkel, mask and fins. He doesn't use the term "snorkelling", preferring "swimming free" to describe what he does when he encounters a swimmable stretch of water as he walks, climbs and camps. A great and inspiring account of human endeavour.