If I was Alduin and I just came back I would make the biggest crap-bombarding Whiterun has ever seen. It would be known as Blackrun from then on. Then I'd throw the most awesome dragon party ever where dragons would kick everyone out of Hall of Valor, drink all the mead we can and then compete in who has bigger ... erm thu'um. Ofc, Dragonborn would be invited too, I'd make a bet with him about who can drink more mead and say 'Yol Toor Shol' while burping. If he wins I'd agree to leave the world alone and chill, and if I win I can swallow the world and I get 2 slave chicks. Fair deal I think.
If I was Alduin I probably do exactly what you described, however I would not kick everyone out of the hall of valor, I just make them as my personal slaves. Since I don't have hands I'm unable to make mead so I need slaves to do it for me. Anyone who is slacking off will be eaten. I would also attack and eat those scumbag blades too before the thalmor gets to them.
and I would make it a tradition to eat 2 virgin women every couple of hundred years... maybe less.