Never apologize for taking a holiday, LOL! We allll need that rest time -- child and parents. And as Nike says, you now know the cure to the OT-blues! Once you get back you will just go back to the routine that was working and after a few days you should be back on track.
You probably can't read this right now but this is for other moms who can relate to your story: while on vacation, you should enjoy yourself as much as you want, but if you see your child getting WAY off track and unhappy from lack of sleep, then take one night in to put your child to bed early. It will truly make your holiday more fun as a tired/cranky toddler can make even the best vacation a huge drag! You definitely don't have to follow the same strict routine as at home, but every few days making sure your child is rested can make all the difference.
My son and I travelled across country when he was 20 months old -- it was a 12 hour travel day with 8 hours of plane flights. It was also a 3 hour time difference from home. I didn't worry about bedtime, but I was adamant that he got to have his nap at the appropriate time every day. Since he was waking earlier than normal in the morning, it was pretty easy to schedule our activities for after his nap -- mornings, we hung out at our villa, swam, did some light shopping, etc. This worked fabulously! He had bedtimes after 9 pm every night, and even after midnight one night! And yet was a happy kid the whole trip. When we got home, he immediatley went right back into his normal routine. I think giving him those naps gave him the stamina.