If you are travelling east, try to shift your routines a little earlier before you leave. If you can, move your wake up and your bedtimes a couple of hours earlier in the week prior to departure--so instead of getting up at 7, get up at 5. And then when you are there, be late risers and late to bed. If your kids normally go to bed at 8, have them stay up till 10 and wake up at 9am.
If you are going west, it's only 3 hours anyway. Think of the first night as something like a late night at home.
Also, build in lots of down time in the first couple of days. Time in the mid afternoon to hang out, read books, nap if anyone wants to, and just chill.