I can answer #2.

I did something like that ~10 yrs ago when I had the family leaving town for a long weekend. My A race that year was a HIM. Organized an "in-town" spring training camp for anyone in our local tri club saying they could join in for any portion they were interested in. The training camp went something like this:

Fri afternoon/evening: swim workout at local pool (something close to Oly distance), 25-30 mile ride, 5-6 mile run on nearby trails. Group pasta dinner at our house w/ everyone who planned on participating in any of the segments over the weekend.

Saturday: 2k-3k swim (customize to individual, telling everyone be prepared to jump on bikes in an hr), 60-80 mile ride in the foothills, 5-10 mile run on nearby trails (trails preferred to keep from beating up the legs too badly over the three days).

Sunday: 50-60 mile ride, 10-15 mile run on trails.

We had approximate start and stop times between each segment so that folks could join as available.

If my A race was full IM distance, we would have upped the mileage.

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Tad

It took awhile, but I finally discovered that its not the destination that's important, but rather the journey.