A PA30 PLT HAS AN NMAC WITH A C182 WHILE RECEIVING FLT FOLLOWING FROM CAPE APCH.

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THIS WAS THE CLOSET I HAVE COME TO KILLING MYSELF IN AN AIRPLANE. OUR RTE OF FLT TOOK US AROUND CAPE COD FROM HYANNIS TO PROVINCETOWN TO NANTUCKET TO MARTHA'S VINEYARD THEN TO FALMOUTH AIRPARK FOR A LCL SCENIC FLT. ON BOARD WERE MY 2 COUSINS (NON PLTS) AND MY 10 MONTH OLD SON. WE WERE RECEIVING RA'S FROM CAPE APCH THROUGHOUT THE FLT. I WAS FLYING AT 2700 FT MSL TO AVOID THE CLASS D AIRSPACE OF ACK AND MVY. APCH HAD BEEN KEEPING US UPDATED ON TFC FOR OUR 45 MINS. AS WE PASSED OVER MARTHA'S VINEYARD; I REACHED A DANGEROUS LEVEL OF COMPLACENCY AND SUFFICIENTLY REDUCED MY TFC SCAN. I MUST HAVE HAD MY HEAD DOWN AND TO THE SIDE FOR 10 OR MORE SECONDS. WHEN I LOOKED UP; TO MY HORROR; I SAW AN OPPOSITE DIRECTION C182 AT VERY CLOSE RANGE AND WITHIN 200 FT OF MY ALT. NEITHER OF US TOOK EVASIVE ACTION; SO I'M NOT SURE IF THEY EVER SAW US. I WAS IN SUCH A STATE OF SHOCK; THAT I COULD NOT EVEN BRING MYSELF TOGETHER TO RPT IT TO ATC. WE LANDED WITHOUT FURTHER INCIDENT. I WILL BE INVESTING IN A BF GOODRICH SKYWATCH.