My family and I are planning to visit Kona in early May.

I am the only diver in the family.  I'd very much like to do some shore
diving while I'm there -- does anyone know how I might go about finding
a buddy over there?  Or should I just plan to keep it above 40 feet and
dive solo?

Another possibility would be a guided dive in a group, but I'm not eager
to have my bottom time gated by heavy breathers who don't dive much.

While I'm at it, some equipment questions:  I normally dive in Monterey,
wearing a 7 mm one piece wet suit with an integrated hood.  Will this be
too warm for Kona?  I suspect yes, but I'm not 100% sure because I know
that folks dive there in May in 5 mm two pieces, which makes for 10 mm
at the core.

Can anyone familiar with Kona diving recommend a shop that rents larger
steel tanks (95 and up) with Nitrox fills?

Thanks!

Eric