One of our favorite hikes, so much we have done it twice this year. It starts from the Almbahn, touches several huts before finally reaching a higher hut for lunch. From their, recharged, we go up to a beautiful lake, before heading back down to the parking lot.
Check at the higher end of the Ehrwald Almbahn if the hut (Seeben Alm) is open, as it's the main refreshment point on the way.
Best time of year
A wide route which is not too steep so it doesn't require any special considerations in my opinion. Nevertheless, check the latest cable car time to make sure if you are exhausted on the way down, there is a 12EUR option to save the day. :)