Access
Gondola or Hike from Urnerboden. There is a bus from Linthal / Flüelen to Urnerboden.
Note that you may need to wait a while at the gondola because it's quite small. When you show up and buy the ticket, you will be told your "time slot". There's a restaurant right above the gondola station where you can wait for your slot.
Rules
Airspaces in Switzerland are a tough subject, get all the info you can get before flying: http://www.flyland.ch.
DABS (active danger areas etc): www.skybriefing.com/portal/