My problem is I still want to return with at least some images. My
only other camera is an Olympus standard SLR with a 70-210mm lens.
This camera has a manual adapter. Not really being a photographer -
could I expect to return with any decent results from this? using a
tripod and cable release? Vibration?

My old none digital SLR only has a 150mm zoom lens. But I got a few nice
shots using tripod and cable release in France 1999. I've posted this before
but in case you missed it.
http://www.suaveharv.com/eclipse.jpg
Other pictures show bailey's beads.
It won't win any awards but it proves I was there I suppose. I'm taking it
again, along with my digitals, but I'm not taking scopes or long lenses etc.
..
It's a worry isn't it? You think it's SUCH a fantastic Astronomical
experience that you have to go balls-out and take the best pictures. But
then you think 'will it detract from the experience?'. Well, if you're not a
die-hard Eclipse photographer, I'd not sweat it. Get a few snaps, then order
some posh prints from a professional to stick on your wall.
I'm taking a bottle of bubbly.
BRING IT ON!!!!