In lower positions, it helps intonation to employ double bass fingering technique, i.e. just index, middle and pinky covering a distance of three frets (and using the ring finger as support for the pinky). Unless you have huge hands, maintaining this left hand shape minimizes strain on the left hand and helps you develop a feel for the proper distance between the intervals.
I dunno about practicing in the dark, but you shouldn't *always* be looking at the fingerboard when you play. If you're making big shifts up and down the neck, it doesn't hurt to look, but work at developing a good feel for the intervals within a given position, or half-step and whole step shifts.
One thing that helps with position shifts: don't lift your left hand fingers entirely from the strings. Release the string from the fingerboard, but keep the finger on the string as you shift to a new position. There's a good (albeit somewhat difficult to explain) exercise over on the double bass board called "explain the shift" that helps with shifting too - basically requires you to determine the interval between certain fingers in the old and new positions. Search for it.
I'll second some ssab67's comments. It's easy and fun to slide around, but too much of it is annoying, and can become a coverup for sloppy intonation, much like singers sliding up to hard-to-reach notes. You should attempt to nail every note you play, and use slides only for occasional ornamentation.