One thing you CAN control is electricity use. Guests are on vacation and are not thinking conservation. Maybe some of the things I have done can help you save a few bucks:
I replaced the garage lighting with shop lights from Costco. They have a motion detector and timer, so they shut themselves off if no motion is detected for 10 minutes.
Almost all lighting has been converted to LED lighting. Not only do they save electricity, they don't burn out, reducing maintenance calls and increasing guest satisfaction.
I replaced the cooktop and clothes dryer with gas ones. That saves a ton! Guests prefer cooking with gas and may not notice that their clothes dry faster - but you'll notice lower bills.
Outdoor lighting is all LED on motion detectors. For some outdoor lighting, I have solar ones which never use line electricity and work if the power is on or off. I installed one above the BBQ, so it lights up the grill when someone approaches.
I installed electronic count down timers for the exhaust fans. 30 minutes in the baths, 4 hours in the kitchen. I got the kind that can't be set to "hold" and run for an unlimited time.
For the sauna and a couple of closets - where it isn't apparent if the light has been left on - I installed switches that glow with a red light if they are left on, prompting folks to turn them off.
If you have an old hot tub, look into replacing it. The new ones are remarkably efficient.
At one point I was regularly using over 2,000 KWH per month - even hitting 2,500 KWH a couple of times. Now, if use goes over 1,000 KWH it's unusual.