I've travelled with my son, and without him... both are amazing for different reasons.
One thing to keep in mind... HE'S having an adventure, too. Getting to stay with grandparents, and be spoiled to bits, is every bit as much fun for him, as it will be for the two of you to get to have time together. Hmmm. Possibly more. It's a phenomenal bonding time, as well. My own mum all but shoves me out the door when I'm considering leaving for a little while so she and my son can have their Nonna-Time. Go, go, go! Have fun. So, really, it's not just the parents getting to reconnect, nor kiddo getting to bond and deepen a relationship with people who love him, but also Grandparents who benefit. Win-Win-Win.
Big suggestion:
- Come home a day before you plan on picking him up. Which sounds unbearably difficult, until you exit off the plan, return home... and want nothing so much in the world as to fall fast asleep and have a vacation from your vacation. Taking care of the jetlag before diving back into parent mode is indescribably useful.
Don't Expect:
Him to miss you. Toddlers have wonky senses of time. If you 3 have a secure connection, he has 100% trust that you'll be home again. Soon. And in the meantime, he's "busy". It's broken more parent's hearts that the truck their child is currently playing with is more exciting than the phonecall, or return home. To a toddler, an hour is an eternity, and 2 weeks is the blink of an eye.
Do:
Talk it up (When on the phone : How exciting for you / So happy to hear you/ etc... instead of weep/sob/I miss you). The more excited you two are, the more excited he'll be. Ditto preschool, primary, etc. If you present this trip as a big, serious, possibly traumatic and stressful thing to him... it will end up being a big, serious, traumatic, and stressful thing. Parents are like Gods to small children. Imagine if God started wringing his hands and crying that he was going to miss us. Um. There'd be rioting in the streets, as people were conviced the world was ending. After all, if GOD is afraid, what chance to do we have??? Conversely; If it's simply matter of course, and how marvelous!, what an exciting adventure you're going to have!... then it will all be brilliant.