While mucking about and later listening to some '50s Jazz Tracks (with drum improvisation to suit the style) I find playing by feel the best, know the theme of the song and (assuming that the other musicians are still playing their parts) accent with the bass drum and other parts of the kit with pronounciation (when you know the other musicians will accent) while maintaining the same ride/hats pattern, then when it feels right (sometimes it just does, especially when the chord changes are about to happen) a sixteenth-note-triplet quarter-/half-bar fill over the snare then toms then going back and forth to ride pattern and fill (ride pattern still on right) seems to work aswell. Experiment and practice in your free time, that thing and adjust it to the songs overall sound.
...also take notice to the solo philosophies of the other musicians, if you listen to Miles Davis, John Coltrane or Duke Ellington sax/trumpet solos they tend to let loose a flurry of notes (slightly audible wall of sound but with an effect on the solo) and the notes you really hear are the accents and the long held notes, but some musicians leave some room and just emphasise on parts of the previous played melody...
...but hey, Jazz was developed as being a free-form style (its not just a style, it's a musical interpretation) open to improvisation and change, that means that Jazz solos don't have very fixed structures but a Jazz drum solo should sound like a Jazz drum solo (hard to explain but listen to some jazz drum solos on youtube, even if it is by Budd Rich, Gene Krupa or by some amateur youtube drummer)).
Explaining solos is hard, not just that drummers have secrets but that explaining it to some-one else tends to be quite obscure/vague if they don't already know your way of thinking. (damn it again, a vague sentence).