Shame you didn't get the weather for the Laugavegur. Believe me... I've had worse... but it's worth going back. Next time, keep an eye on the weather and go there as soon as good weather is forecast. That's easy enough to do if you're staying around Reykjavík, Hveragerði, Selfoss, Kirkjubærklauster or Skaftafell, because you can just get the very next bus to Landmannalaugar. It's not the sort of trail where you can arrange everything in advance and expect the weather to be good.
Anyway... Day 2 from Hrafntinnusker to Alftavatn would have been splendid in good weather. Last time I did that, there was good snow cover, which makes the walking much easier, and the views were magnificent. On the other hand, I've done that in howling gales, mist and rain, and without the snow cover the high parts are criss-crossed with confusing gullies... and I wouldn't recommend that to anyone.
If you get back there, it's worth taking a break at Hvangil, between Alftavatn and Emstrur, because there's an excellent short mountain ridge walk, which you can tie in easily with a valley walk and lots of waterfalls. So... if you walk for a couple of hours from Alftavatn to Hvangil, dump most of your gear at the hut, then spend a few hours on the ridge and waterfall walk, then that makes a splendid day.
The walk from Hvangil to Emstrur is mostly very easy gradients, but the day starts with a river crossing that can sometimes be quite difficult. Last time I was there, a party came across the river and were absolutely drenched. Next day, when I crossed the same river, it was knee-deep and no big deal. Anyway, apart from the river, it's an easy day with scenic fells nearby that you don't actually climb. At Emstrur, you HAVE to make the detour to see a deep canyon at Markarfljótsgljúfur. This is only 15 minutes off-route, but even if you walk there from the hut, it's barely half-an-hour. Some Americans said it was more impressive than the Grand Canyon!
The day after Emstrur starts very well, crossing a deep gorge using a tiny footbridge, but later the scenery is less impressive, and it seems to take a while to reach Þórsmörk. Before you get there, you have to ford a glacial river. Last time I forded it, it was pretty easy, but the first time I forded it, it was quite dangerous. If you can't ford it, then you're stuck!
There are lots of walks you can do from Þórsmörk, and the best thing is just to get the local map, the pick routes from a dense network and just go for it. The main thing would be to climb Valahnúkur for the view.