The rescue strobe part of the equation is easy. West Marine carries a wide variety of small strobes designed to be attached to your PFD. I would avoid the ones that are water activated because they will activate whenever you dump even if you do not need help.
Proper lighting for the boat is prescribed by the USCG Regulations and/or COLREGS. The USCG Regs (
www.uscgboating.org/images/420.PDF) cover US inland waters and the COLREGS (
www.jag.navy.mil/distrib/instructions/COLREG-1972.pdf) cover international waters, although in this case both are identical. The only legal way to light your ski is to display the same lights as a sailboat (red/green forward and white aft) or to have a flashlight ready to illuminate in sufficient time to avoid a collision. Personally I use a small waterproof LED flashlight attached to my PFD. I do not like to have the light on all the time because it destroys my night vision. On the water at night I find that I can hear and see other boats long before they get close to me, so I have time to shine my light at them.
I strongly advise against using any other lighting configuration because on the water, certain light configurations have very specific meanings. The idea of a deck mounted 360 degree light is not good because that is the configuration for a vessel at anchor. The idea of using a flashing red bike light is really bad because many red navigation buoys have flashing red lights. It is possible that another boater could mistake your flashing red for a red channel marker, which could put him aground.
If you want to really do it right, take a look at the Navisafe Lights. You would need one with red/green sectors on the bow and one with an aft white sector on the stern.