My sister's a high school teacher. She's childless and single.
She genuinely couldn't even afford a Sun holiday this summer.
She lives in a very quiet area, but it's 'touristy' so the rent is extortionate. She also pays a lot towards her car each month.
Her biggest bug bears are kids strolling in late to her class, homework not being completed, and pupils having days off for daft reasons (holidays included). It messes up her lessons and definitely does interfere with the other pupils' learning.
She has this year decided that she will volunteer to hold a session at interval/lunchtimes 1-2 days a week to catch up the absentees (unless they had a good reason for being absent, if so they'll be helped in class time) and latecomers on missed work. It's then up to the children whether or not they care enough to attend the extra sessions.
She's been back 3 weeks now, and out of six lunchtimes only 2 children have bothered showing up for the extra lesson, despite there being numerous children just arriving back from holidays last week.
To be honest, I'd rather just save up the money for a year or two and try and go somewhere cheap during the holidays. I'm in Scotland, and most places only up there prices to coincide with English holidays, so I manage to find a cheap caravan for the last week of June/first week of July.
Op, i think your children can have the best of both worlds here. It'll just take a bit of planning and organisation. Leave Friday afternoon after school, and come back Sun night.