Vacation During IM peaking

Interesting.  I am also doing IMMD this year, my 12th Ironman.  I took a break and haven't raced one since 2015.  I'm also doing the Be Iron Fit competitive program.  This is a 30 week training plan, so if you're following it then your training starts Monday 3/5 (ironically, with a rest day), and ends 30 week later with race week of 9/24.

The plan calls for you to have a half IM race 8 weeks before, which is August 4th or 5th.  I chose the IM 70.3 in Boulder which that weekend.  You say your vacation is through "the first week of August" so yes, you're missing the first two weeks (week 21 and week 22).

Do you already have a plan for your HIM?  I think your best bet is to start your race plan 2 weeks early, race your half IM in mid-July just before your vacation starts, and then take your 2 week vacation and restart the plan.  A 2 week gap is not going to kill your training if you keep runs and swims.  Think of it as active recovery. 

How old are your kids?  Vacationing with little ones and leaving your partner behind to take care of them while you go for a 2 hour run is a well-known bad idea.

I think you should reduce the running and increase the biking, because:

• Your 2 hour long run is much more than Fink calls for in the base period.  I think I see his first 2 hour run at week 20.  2 hours in early February is a lot of running an IM in September; you're doing more like marathon training.
• Your 90 minute bike is low.  That's week 2, and it just gets longer than that.  Week 10 ends with a 3 hour ride.
• A 1000 yard swim is 20 minutes.  Reasonable in February.

A strong IM is really all about the pacing on the bike.  You have to swim well enough to get out of the water ready for 112 miles, so 1:25-1:35 is fine.  But the 112 miles is very tough on the less prepared. Many people overdo the bike on race day, riding harder and faster than their training.  They get to race day with one century done, and a bunch of 5 hour 80 mile rides.  And the last 15 miles blows them up and their run suffers.  Worse, many runners intentionally train hard for the run and intentionally undertrain the bike.  They do 60 mile and 80 mile rides, and then experience a 7 hour sufferfest and can't deliver the run performance they had planned.

Further, training plans like Fink's are not intended to be glideslopes you can intersect.  You should be aiming to complete the full long core workouts per the book, every week.

So I suggest you cut back your long run and put another hour into the bike.

Get up in the morning when everybody else is sleeping in and do the runs.  That will go a very long way to maintaining fitness (and running is the first to go), and you won't be stepping on any toes.

Yeah, you might get some swim training in while the kids are frolicking.  Probably not.  Don't sweat it.

Forget about the bike.   As stated, if you attempt to get your 'proper' bike training in you will just ruin your vacation and probably not get very good bike training anyway.  If you're already well-prepared otherwise, it'll be fine.  You're not going to blow the lid off the race, but was that your plan anyway?