Can you book that extra night at half price since you're not staying overnight? Unfortunately no. Our cleaner doesn't do night cleans, so she won't be able to clean until the next morning.
What are some trip ideas for those who don't book an extra night? Well, some guests go for an upcountry drive, up Haleakala (bonus, it's cooler up there, so those mainland clothes won't feel so hot). You could spend a few hours at the
Maui Ocean Center (bonus, it's air-conditioned). Even if you've checked out, you can still use the condo's pool (and the public/guest-use bathrooms) for the rest of the day.