Not even a full weekend, but definitely worthwhile: swap out your toilet seats for the soft-close variety.. Toilet seats get gross and worn over time, and I can't explain how "luxurious" soft-close seats feel.. Not to mention it'll completely save your sanity if you have kids in the house.
I used these, but you don't have to get them from amazon - Lowe's and Home Depot sell them too. Expect to spend about $40 each.. They come in the standard (circular) and elongated varieties - make sure to grab the one that matches your toilet (if unsure take measurements of the bowl before you go shopping - the box has the measurements right on it). They take about 5 minutes each to install assuming your existing bolts aren't rusted. And as an added bonus they detach without having to remove the bolts for easy cleaning.
Just leave one of these outside their door :)
I saw a slow-close or quiet-close toilet seat and now my whole house has them. Game changer.
Kohler has what you want
https://www.amazon.com/K-4636-0-Quiet-Close-Grip-Tight-Bumpers-Elongated/dp/B000TFHN56
Grip tight means you pull the seat off and can chuck it in the tub and bleach it and reattach it without any tools
Will never go back. KOHLER K-4636-0 Cachet Quiet-Close... https://www.amazon.com/dp/B000TFHN56?ref=yo_pop_ma_swf