CFI RATED PLT OF C172 IS FRUSTRATED WITH CONFUSING CLRNCS AND INSTRUCTIONS FROM LGB TWR.

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2 MINOR PROBS; NO VIOLATION; NO NEAR MISS; NO RWY INCURSION. TAXI DIFFICULTIES AND LGB ARE ONE THING IN THE SAME; KNOWING THIS I HAD THE RWY DIAGRAM ON YOKE. TAXI FROM THE FBO TO RWY 25L AT TXWY D INTXN FOR TKOF. PLATE WAS REVIEWED. SIMPLE EXCEPT PROGRESSIVE INSTRUCTIONS WERE REQUIRED DUE TO TXWY D AT RWY 25L NOT MARKED. IF YOU LOOK AT THE PLATE TXWY D AND RWY 34R AT THE E END OF TXWY F; THE EXPANSE OF PAVEMENT HERE IS UNMARKED; WITH SUCH CLOSE PROX TO RWY 30 IT IS A BUSY PLACE. IS IT POSSIBLE TO MARK THIS MORE CLRLY? NEXT TIME I'LL KNOW; BUT I COULDN'T HAVE BEEN BETTER PREPARED. CLRNC DELIVERY INSTRUCTED ME TO DEPART RWY 25L AT TXWY D; DEPART E TO THE HIGHWAY 91/605 INTERCHANGE AT OR BELOW 2500 FT MSL. THE PROB IS IF I TURN DOWNWIND ON RWY 25L TO THE E AS INSTRUCTED I WILL NOT END UP AT THE 91/605 INTERCHANGE DUE TO THIS CONFUSION I REQUESTED TKOF CLRNC L DOWNWIND DEP WHICH WOULD HAVE SENT ME E AS INSTRUCTED. ONCE AIRBORNE I WAS FIRST INSTRUCTED TO DO A L 270 DEGS; THEN A R TURN TO A HDG OF NE WHICH DID PUT ME OVER THE 91/605. THE PROB IS THAT I WOULD HAVE PREFERRED MORE SPECIFIC INSTRUCTION FROM CLRNC DELIVERY. I NORMALLY FLY IFR TO AVOID THESE PROBS YET ON A PRISTINE SUMMER NIGHT I THOUGHT THIS UNNECESSARY. MAYBE FROM FLYING IFR SO MUCH I EXPECT SPECIFIC INSTRUCTIONS. I AM A CFI AND CAN'T IMAGINE HOW A LOW TIME PLT MIGHT HANDLE THIS SIT. I CAN FLY THE AIRPLANE ANY WAY THEY WANT; BUT I NEED TO KNOW.