Terrible thread necromancy here (hello from 2016!), but I want to share my impressions of Seasons, too, since I only got it a few months ago.
I really, really like the holidays and festivals added into the game. I love spending leisure day skating, collecting flowers, and playing soccer. The fireworks are also on point.
I figured out a "cheaty" way to give at least the active household children a summer vacation. One of the Nraas mods (Careers, I believe?) gives you the option to sign the children and teens up to be homeschooled. All they have to do is download their homework assignment from the computer, complete it, and then download another homework assignment. Then, when Fall rolls around, sign them back up for normal school until the next summer and you put them back into homeschooling.