Oh yeah!!!! I remember those days!!! Everyday, my toddler needed to get out of the house! We went for a walk, we'd go around and visit a neighbor or two, we'd walk or drive to the grocery store, whatever, we were out everyday!
Then we moved just before summer to Arizona, where the nearest grocery store was a 20+ minutes drive, where we didnt know anyone and it was just too dang hot to walk!! That was a really rough move on all of us!
I'm not sure what I can tell you that will help, but you're not alone! It did change for us after we moved here in that he now would rather stay home than go out (he's 8yo now) I suspect it has more to do with his hearing loss that occurred around then rather than the move, although I'll always wonder....
Maybe.. set some kind of a routine, where you are out (errands, a walk, playground, whatever) and get home before his naptime, so he knows (oh he'll fight it big time at first and probably constantly test to see if it'll change) that everyday, after we've been bye bye to (a walk or the playground for example) then we get home and have lunch then we have a little bit of playtime then it's naptime. then we can go outside in the backyard or for a short walk again, then mom cooks dinner.... Just a suggestion? I honestly dont remember what I did /didn't do, what worked, and how I dealt with it.