PVT PLT OF A SMA TWIN ERRONEOUSLY ENTERED A RESTR AREA DUE TO AN INFLT ENCOUNTER WITH WX.

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I DEPARTED CADILLAC/WEXFORD CITY ARPT ALONE ON JUN/XX/94 APPROX XA30 LCL TIME IN GOOD VFR CONDITIONS FOR A 2 HR FLT AT 6500 FT. DIRECT BADGER VOR; DIRECT RFD; DIRECT GBG MUNICIPAL. PHONE CALL TO GBG AWOS RPTED CLR BELOW 12000 FT; 10 MI VISIBILITY: AND MY IMPRESSION WAS THAT VMC EXISTED ALONG ALL MY RTE. I; TOO; NEGLECTED TO GET A FULL BRIEFING FROM FSS TO CONFIRM THAT -- OR RATHER WOULD HAVE TOLD ME ABOUT ENOUGH CLOUDS AND RAIN SHOWERS THAT I WOULD HAVE FILED IFR; FOR WHICH I AND THE AIRPLANE AND QUALIFIED AND EQUIPPED. NEAR MUSKEGON SOME CLOUD BUILD-UP WAS EVIDENT TO THE W; AND CONTACT THEN WITH LANSING FSS CONFIRMED BROKEN CEILINGS 3000 FT AND RAIN SHOWERS NEAR AND N OF MILWAUKEE. AT ABOUT MID-LAKE MICHIGAN; BENEATH THE MINNOW MOA; MY RTE AHEAD SEEMED ACCEPTABLY VMC; BUT I THEN NOTED THAT ON THAT LINE I WOULD VIOLATE R6903: SO I TURNED DIRECTLY TOWARD FALLS VOR TO PASS W OF R6903 LIMITS. THAT DIRECTION HOWEVER TOOK ME INTO A RAIN SHOWER AREA SO THAT VISIBILITY WAS PROBABLY LESS THAN VMC AT TIMES. FROM NEAR FAH; I RESUMED SW HDG TO PASS 10 MI OR SO W OF BAE TO STAY WELL AWAY FROM MILWAUKEE; TIMMERMAN TFC: AND STARTED DSNDING: SO THAT BY ABOUT 3500 FT. I WAS BENEATH THE CLOUDS AND ABLE TO STAY IN VMC; STILL IN RAIN AT TIMES. A SHORT DISTANCE SW OF BAE THE RAIN ENDED AND CLOUDS WERE ONLY HIGH SCATTERED. I RPT THIS OCCURRENCE AS RECOGNITION BY ME OF A NUMBER OF POSSIBLE OR NEAR VIOLATIONS: SUCH AS; NOT GETTING FULL BRIEFING FROM FSS; FROM WHICH I PROBABLY WOULD HAVE ELECTED TO FILE IFR; OR AT LEAST HAVE GONE A MORE SOUTHERLY RTE WHERE IT WAS BETTER VMC. I PROBABLY INTRUDED SOMEWHAT INTO R6903 BEFORE CLRING THE WESTERN LIMIT; AND I WAS IN AND OUT OF WHAT WAS PROBABLY MORE TRULY IMC THAN VMC FOR A SHORT PART OF THE FLT. THIS FLT BROUGHT BACK CLRLY TO MY ATTN HOW CASUAL I SEEM TO HAVE BECOME ABOUT PLANNING: AND ALSO HOW MUCH MORE PRACTICAL AND TIME SAVING; AS WELL AS SAFER; IT WOULD HAVE BEEN TO JUST ROUTINELY CALL AND FILE IFR! ALTHOUGH THIS FLT HAD AN ENTIRELY SATISFACTORY OUTCOME FOR ME; I REALIZE I MIGHT WELL HAVE CAUSED DISRUPTION FOR OTHER PLTS AND THEIR CTLRS -- AND FOR THAT I AM SINCERELY APOLOGETIC: AND I INTEND TO AVOID SUCH IN THE FUTURE BY TIGHTENING UP MY DISCIPLINE AS TO PLANNING; BRIEFING; FILING AND FLYING.