Dan, I'm mighty sorry!
I noticed only today your question! At the time, I just lost the pointer to this topic,
and forgot about it.
I know it's too late but, FWIW today...
Valgardena can be reached skis on foot from Cortina.
Take a bus, or a taxi, from Cortina toward Passo Falzarego.
Ski down the Falzarego (it's a 6-7 km run) until you reach Armentarola/S.Cassiano
From there you can then proceed and ski to Corvara, then take the lifts which will bring you to
the Passo Gardena, and you're there, then you can choose to ski this bit of Selva,
or go further and reach S.Cristina (seat of one of the DH races).
This can take well all your day, so think about getting back with a taxi (expensive!)
or a bus or, go really fast on skis, don't loose your time watching the scenery,
travel light and with an homogeneous skiers (as far as skills is concerned) group...
But the risk to remain "without lifts" in the middle of your way back is real...
Another option would be to take a car, drive along the same path I mentioned above
(on the road, not on the skiing fields [img]smile.gif[/img]) and reach the Passo Gardena,
put your skis on and proceed from there.