In reply to Shapeshifter:
You'd need to be seriously fast to do a proper Alpine TD in a day from the valley. A more sensible choice would be:
a mid altitude rock route from the Plan so you can walk down if you miss the last lift, e.g. Le Ticket on the Peigne (E2 6a crux protected by a couple of bolts, mostly E2 5b slab work with spaced trad gear, about 6 pitches, ab down, about 1-1.5hrs walk in from the lift, very good slabby climbing. Or the Peigne normal route (AD but a proper Alpine route).
or a rock route on the S face of the Midi or the Eperon des Cosmiques (the Rebuffat on the Midi is the big classic with the obligatory queues on nice days), trad from about E1 and harder. Don't miss the last lift! It's high up so altitude is a consideration.
Or if you want mixed, one of the Contamine routes on the Tacul Triangle - AD, day trip from first lift as long as you mostly move together. Same re altitude and bear in mind the slog back up the Midi ar£te will be a struggle!
Lots of bolted rock routes in the Aiguilles Rouges doable in a day.
Frendo is the big one to go for but you'd need to stay at the Plan hut or bivvy (and leave kit stashed) the night before - if you miss the last lift you can have a miserable night in the Midi lift station or a less miserable night at the Cosmiques hut.
Or the weather might be crap!
Post edited at 15:10