Richard Graef, co-principal flute of the CSO, used to tell me to always try to relate a melody to something physical. For example, I was having trouble once with a very long, slow ending that descended by whole and half steps over four slow measures.
He said, "I look at this I see see something heavy but still flying, descending slowly, coming in for a landing, something of great weight like a 747." And bingo! I knew exactly how to play that.