I hear ya...lots of irons in the fire. I'm stretching this myself. Originally was only going to do a 3 day stretch, but turned into the full week, plus.
I'm confident there would be room for one more person, but that'd be on the guys I'm w/...I'm splitting the Jeep rental w/ them, they are doing a VRBO in town and I'm staying out at KOH w/ another group. The one thing I coordinated was the flight dates/times so didn't have to rent my own vehicle...if you're serious I'll get a message out w/ everyone in it for some real talk. LMK.
Hell, I've taken nearly 4 weeks of vaca this year and my wife/son are going to FL tomorrow for the week...I'm not going. They go out on a trip like this tho, used to be the wife and two kids...now just one. I do more long weekend trips they don't want any part of

Well, sitting on a beach in FL doing absolutely nothing is sometimes appealing, it's not at the moment - meh

I may use a couple more days, or roll them into next year...but in reality, I don't have a full week to take anyway...I get to stay home and drink by myself - which is nice, too