In reply to Sash:
Have edited by guide. Thanks for that. Luckily campsites have wifi, and we spotted the closure of the Tete aux Chamois before going.
The Cascades VF was v strenuous, but then roadside VFs described a "hard short sport" routes generally make you dangle from your arms much like climbing walls do to create interest. After heavy rain the Cascade was amazing. I recommend it after a spell of bad weather, and later in the day as it can be busy.
The Grindelwald area is good, with a number of good days out. Do the Rotstock and you can tell everyone you've been on the North Face of the Eiger
. Don't do the Murren VF above Lauterbrunnen valley (not in the guide). Its 100m of pure adrenalin dangling on loose cable over a 600m undercut drop, followed by a fairly dull walk in the woods.