Unfortunately, you have chosen to visit during an off-peak time (hence why Disney offers
free dining deals at this time of year) so you do need to expect some maintenance to be going on - they have to do the work sometime, and off-peak inconveniences the least number of people. Sadly though, you are one of those people.
The bridge (well, one bridge out of the three) over to the island is closed daytime-only for a few days for decking replacement. It should probably be done by today or tomorrow I'd have thought. The pool lifeguards (and hence the slide too) usually finish at 8pm, or 10pm during peak summer periods. The pools are still open (and yes, they do have to shut the whole pool at least once a year for routine maintenance) but they do shut the slide and water features when there is no one on duty. The lifeguards might be on duty longer at the weekend, but I can't say for sure.
The campfire firepit is being updated (I believe to fit in with safety regulations, but I'm not sure). It's due to re-open sometime mid/late September after a month's downtime, but the exact date is a bit flexible as some of the work is weather dependent. In the meantime, the POFQ one is lovely and the resort is worth a visit anyway (if you don't fancy the walk ask if they can take you over there for the firepit, or get the water ferry).
The aircon in the laundry seems a relatively small point unless you want to set up camp in there, but I guess on top of the other things it's an extra annoyance for you - however again, they do need to do work sometime.
Towel animals are a nice bit of pixie dust if you get them, but not a listed room feature as far as I recall so it'd be hard to make a complaint based on that.
And do remember that these same sorts of jobs needs to be done at Values and Deluxes, so it could just as easily happen to you there. Well, apart from the pool slide anyway, the Values don't have one to close.
Andre