"Rogue Saucer"(#39) was a pretty good romp that, if I recall is set in TNG's 8th season, just prior to Star Trek Generations. "Foreign Foes"(#31) was also another good book from the 30's, and it deals with Klingon's. #44 "The Death Of Princes" was also a good read.
But you might also want to check out some of the TNG Starfleet Academy series, specifically #4 "Capture The Flag", #8 "Starfall" (this book describes what happened to Picard that caused him to try twice for his entrance exam), #11 Crossfire & #13 "The Haunted Starship".
But, just to warn you, avoid #45 "Intellivore".