The jets are awkward for snorkeling. They seemed to have a lot of resistance to breaking the surface of the water on the downstroke, and I know that I eased off my kicks to prevent my legs from burning out early. That cost me some time. I probably didn't go hard enough, since I wasn't sore the next day.
What was worse, though, was the equipment set up. I know, easy stuff, right? I drag out my "recreational" kit (which I hardly ever look at, much less dive; I dive a Hogarthian kit), connect my regulator--all the while wondering why something doesn't seem right--crack the tank valve and hear a hissing. It takes me a minute to realize that I didn't have a LP inflator hose on the first stage and the port was not plugged. I cannibalized the set for my brother to use months ago and completely forgot about it. Stupid error, not inspecting my "rec kit" before leaving the house. Maybe a worse mistake was not bringing my "standard load," which has just about everything I could possibly need, so even if I was short a piece of kit, I'd have a backup.
And then the snorkel. I had to admit to my instructor that I don't own a snorkel. He told me that I'd need to (re-)learn "the PADI way" of doing things.