Me, personally, does'nt much worry me the time of day or the crowds present, however I only hunt in the water whether its Port Phillip Bay {no swell, surf} or lakes. And only on snorkle. I get a few strange looks marching down to the water in full wetsuit with mask, snorkle, flippers, hand scoop and trusty Excal 1000 but once in the water I bother no one and no one bothers me. I just look like one of many tourists or kids playing with mask and snorkle, the Excal and scoop are out of sight and out of mind.
I regularly spend 7 to 8 hours on a hot summers day working from a couple of feet to 5 or 6 feet of water with virtually no hassles and certainly no aggro.
Having been a competition spearo for over 30 yrs I can comfortabley hold my breath for 2-3 minutes at a time in these shallow waters spending more time below than above. The only problems I have is when people don't realise I'm down there while I'm struggling to find an elusive target and they inadverdently step on me, in which case they're generally most apologetic.
A couple of days ago while working away I surfaced beneath a dog who absolutlely crapped itself, convinced that the monster from the black lagoon was trying to get him. He high tailed it to the safety of the beach where he rediscovered his bravery and barked and growled at me while its owner and I cracked up laughing.
Yes folks, snorkle is the way to go, certainly in daylight hours. Wading has got whiskers on it, endless dirty looks or, "what you doin mista?". Targets are heaps easier to locate and you see so much more in the way or fish, crabs plus the weird critters that you dig up.
To improve my hearing I cut the hood off an old wetsuit and cut holes in it for my ears to stick out, pop the headphones on and Bobs your uncle.
The only times I will need an air supply is when I eventually hit areas with virtually or actually nill visibility cause it takes to long to relocate where you've been once surfaced.