One thing I LIKE to practice doesn't need a keyboard at all...

Ear training. It's probably more important than the finger exercises, in practice. Chord recognition, intervallic recognition, scale and mode recognition...

Back at the keyboard, I like to do a lot of 'scat/play' exercises. You know, sing a line, then play it. Sing a longer line, play that. Everyone has a pretty decent soloist in their head... getting it out to the fingers takes less in the way of technique, and more in the way of ear training.

My other favorite 'practice' is to turn on the radio, or internet radio, or put my iTunes library into 'shuffle' mode (random play), and simply try to play as well as you can on every tune that comes up, whether you know it well or not, whether you like it or not It is the PERFECT exercise for going out and jamming. Try to find something that fits on top of what is already going on (don't 'sit' on an existing part). Be creative, be tasteful, be 'in the moment'. DON'T use your transposer! Play it in the key it comes in. You will quickly find out where your weak areas are, and can concentrate on improving those later

'Practice' doesn't need to be scales and rote exercises to be effective.