AN SMA PLT REGRETS NOT HAVING FILED A FLT PLAN FOR A VERY SHORT FLT.

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ON SEP/SUN/95; I FLEW IFR FROM LGB (TWRED ARPT) TO RIR (UNCTLED) FOR BREAKFAST. WE SPENT A COUPLE OF HRS OR SO AT RIR; THEN DEPARTED VFR FOR L66 (UNCTLED) ABOUT 12 NM AWAY TO CHK OUT ACFT ON DISPLAY THAT DAY. I DID NOT CALL FSS FOR INFO ON THE RTE OF FLT OR THE DEST ARPT SINCE IT WAS SO CLOSE. IMMEDIATELY AFTER TKOF FROM RIR; I CONTACTED RAL (TWRED) TO TRANSITION THEIR CLASS D. I MONITORED UNICOM (122.8) BEGINNING ABOUT 6 MI FROM L66. THERE WERE AT LEAST 3 ADDITIONAL ARPTS IN THE AREA THAT WERE USING THE SAME UNICOM (122.8) AS L66. I CALLED CORONA UNICOM ABOUT 3 MI FROM THE ARPT. THE PERSON ON UNICOM GAVE ME LNDG INFO WITH 'L TFC; RWY 25.' I DID ABOUT A 3 MI 45 DEG ENTRY AND ENTERED THE DOWNWIND. I ANNOUNCED MYSELF ON THE 45 DEG AND DOWNWIND. I BELIEVE I WAS ON DOWNWIND WHEN THE PERSON ON UNICOM INDICATED I SHOULD CONTACT THE 'TEMPORARY TWR' ON 126.4. THIS WAS A SURPRISE AND THE FIRST TIME I HAD HEARD OF THE TEMPORARY TWR. I IMMEDIATELY CONTACTED THE TEMPORARY TWR ON 126.4 ON EITHER DOWNWIND OR BASE LEG. BEING ESTABLISHED IN THE TFC PATTERN; ANNOUNCING MYSELF AND MY POS SEVERAL TIMES IN THE PATTERN AND WITH AN EXPERIENCED PLT AS A PAX ALSO LOOKING FOR TFC; I DECIDED TO CONTINUE THE APCH. THE TWR CLRED ME AS #2 BEHIND A CESSNA. WE WERE UNABLE TO SPOT THE CESSNA THAT WAS SUPPOSED TO BE IN FRONT OF US EVEN AS LATE AS FINAL. I CALLED TWR AGAIN ON FINAL INDICATING I DID NOT HAVE THE #1 TFC. TWR THEN CLRED ME TO LAND AS #1. THERE WAS NO PLANE IN FRONT OF US FOR LNDG. DURING THE APCH; I HEARD SOME CONFUSION BY THE TEMPORARY TWR AND OTHER TFC IN THE PATTERN. I CONTEMPLATED DEPARTING THE TFC PATTERN. ONE CESSNA DRIVER ANNOUNCED 'I'M OUT OF HERE' AND LEFT THE TFC PATTERN. I DECIDED IT WOULD BE SAFER TO CONTINUE MY LNDG. I THOUGHT IT MIGHT CAUSE MORE OF A PROB FOR ME TO PWR UP AND DEPART THE TFC PATTERN. I CONTINUED ON AND LANDED WITHOUT EVENT. THIS SIT CAME ABOUT BY MY NOT HAVING OBTAINED 'ALL AVAILABLE' INFO. I COULD (AND SHOULD) HAVE CONTACTED FSS AND THE DEST ARPT PRIOR TO THE FLT. I ASSUMED THAT SUCH A SHORT (12 NM) FLT SHOULD BE VERY STRAIGHT FORWARD. HAVING DISCOVERED THE TEMPORARY TWR SO LATE IN THE FLT WAS UNSETTLING. I WAS FURTHER SURPRISED THAT THE PERSON ON THE UNICOM FREQ DID NOT TELL ME OF THE TEMPORARY TWR FREQ ON MY INITIAL CALL IN. I CERTAINLY SHOULD BE (AND WILL BE) CONTACTING FSS MORE READILY FOR THOSE SHORT 'NEIGHBORHOOD DRIVES' AS WELL AS THE LONGER FLTS AND PARTICULARLY WHEN AN 'EVENT' (EG; ACFT DISPLAY) IS KNOWN TO BE GOING ON. CONTACTING THE DEST ARPT WOULD BE A GOOD IDEA. ADDITIONALLY; I WILL BE CONTACTING THE UNICOM FREQ OF UNCTLED ARPTS MUCH FARTHER AWAY FROM THE ARPT IN THE FUTURE.