Long exposures for the Maxxum 5000?

I am wondering how to create effective long exposures with my Minolta Maxxum 5000. The longest the shutter speed is 4 seconds and my camera does have a bulb feature. However I cannot find a place for a cable release and therefore refrain from using the bulb setting even with a tripod due to the risk of blurry images resulting from my body vibrations while pressing the shutter on. Any ideas?