Your proposed schedule should work.
Agree with Horseshoe Meadows (10k), with day hikes higher that will not wear you out. Onion Valley would be an alternative. Mammoth is too far, and too low.
This is exactly the scenario that I like the use of Diamox.
By the way, you can simple take a dose or three at sea level to evaluate your tolerance....the side effects are identical at all elevations. I recommend this.
1/2 tab before bed, two nites before your hike.
One other thing. Every hour, take a 10 minute break, sitting down. This allows the body to "catch up" somewhat, and gives your leg muscles a break. It pays off for some people many hours later.
Make SURE you pee within the first three hours. A good habit is to down a quart of gatoraide at the trailhead before heading out. (I'd give up the coffee, as it is a mild diuretic you don't need that morning) Most people are dehydrated, and it doesn't help.
Best of luck!
