how to surprise my hubby?

We've been through a very hard time the last few weeks and due to very bad memories we want to move out of the house we live in right now.
He works a lot and comes home to help me with the kids and cleaning/cooking and stuff and is still trying to find a new house with a realtor we know.
I'll leave to visit my family in Germany for a while and take the kids with me and he will stay here and deal with all that moving stuff.
He will have a lot to do and we will barely see each other the following weeks so I wanted to surprise him.
He loves his cars and wanted a new one he fell in love with and I thought maybe something like that but he already has like so many cars and another luxurious item won't make him happy anyway and I want it to be more personal. 
I thought about booking a flight for a little getaway with the kids we planned and didnt work out but I'm not sure. 
Any ideas?
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Sorry I accidently posted this in the wrong group