Dragonlance is huge!!!! It is great but not a story solves itself in less then 4-5 paperbacks.
For some pretty good Sci-fi get Larry Niven:
The Mote in God's Eyes / Mote II
or
Integral Trees / The Smoke Ring
or
Bewoulf / Bewoulf's Children
or
Ringworld / RW II / RW II
I also like David Brin's Startide Rising and it's 2 sequels
Or for Fantasy: Stephen Brust
Jhereg/ Athyra and his other 4 books on the series
Stay away from Piers Anthony on the Fantasy shelves. Unicorns, kiddie stuff and girly stuff gallore. My kids love it!