Oh,, shameless plug for a dive shop i hope survived .
on the south side of lahinia there is a dive shop on the waterline,,
the shop has a patented snorkel design they sell that makes breathing much more efficient and easier to breath through
( I won’t give the design away, I’ll just say that you aren’t inhaling half the exhale you just exhaled that is still in the uptube,, it really works.)
Sounds like one I purchased in Miami (keys) back in the late 80s..
Had a semi triangular attachment on top that had a rubber diaphragm inside to make it one-way, so the water didn’t come into the snorkel.