CAPT OF BOEING 767 UNILATERALLY DEVIATES FROM DISPATCHED RTE FOR PERSONAL PURPOSES.

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AT TICKET COUNTER SPOKE WITH PAX AND PAX WIFE. TICKET AGENT AND PAX ADVISED ME PAX WAS UPSET REGARDING HAVING AIRLINE CANCEL EARLIER FLT AND RE-BOOKING; ON OUR FLT. ATTEMPTING TO APPEASE PAX I APOLOGIZED AND MENTIONED WHAT A BEAUTIFUL DAY IT WAS FOR FLYING. TOLD PAX IF ATC COULD APPROVE WE WOULD GO A LITTLE S OF OUR NORMAL RTE AND HE MAY GET A GLIMPSE OF CHESAPEAKE BAY; THE BAY BRIDGE; THE NAVAL ACADEMY AND PERHAPS GIBSON ISLAND WHERE HE LIVES. PAX SEEMED PLEASED. LATER ON BOARD ACFT DURING MY INITIAL WELCOME ABOARD ANNOUNCEMENT ADVISED PAX OF SAME. EARLIER HAD TALKED TO DEP CTL AND ADVISED THEM OF OUR PROPOSAL TO HEAD TOWARD GRACO INTXN IF THEY WERE NOT TOO BUSY. DEP CTL ADVISED NO PROB. AFTER TKOF CONTACTED DEP CTL AND WAS CLRED DIRECT TO GRACO INTXN; MAINTAIN 3000 FT; DEVIATE AS WE LIKED. ABOUT HALF WAY TO GRACO I QUERIED DEP CTL ABOUT THEIR MINIMUM VECTORING ALT FOR OUR AREA JUST TO MAKE CERTAIN WE WERE LEGAL. DEP CTL CLRED US TO DSND TO 2000 FT; INITIATED DSCNT JUST PRIOR TO ABEAM GRACO AND STARTED A TURN TO THE NE. ABOUT THE SAME TIME DEP CTL INQUIRED WHEN WE COULD PROCEED ON COURSE. I ADVISED 3 OR 4 MI (AFTER COMPLETING OUR TURN) OR WHENEVER REQUIRED BY ATC. THEN CLRED TO CLB TO ???? FT; AND CONTACT DCA ATC. PROCEEDED AS CLRED. THE WX WAS CAVU WE WERE AT ALL TIMES UNDER ATC APPROVAL AND CTL AND NEVER DEVIATED FROM OUR CLRNC OR ALT. IN AN ATTEMPT TO GIVE THE PAX A NOT OFTEN BEAUTIFUL VIEW OF THE AREA AND TO PLEASE SOME UNHAPPY PAX I MAY HAVE IN SOME PERSON'S VIEWS GIVEN THE IMPRESSION OF INDISCRETION.