1) Report your passport stolen to your nearest embassy. This is critical. Make sure this is done first
2) Report the theft to the local police and describe everything in detail as much as you can. Do it soon so that it is fresh in your mind
3) Keep an eye on sites like craigslist for sale of macbooks in the area. Yes this is pretty much a long shot but you never know. There are plenty of stupid thieves in this world and the thief might try and sell it right away.
4) Did you have any kind of tracker app on your ipad etc ? I think Apple has something right ? If yes, try and use it to locate your belongings. UPDATE: as ericcholis mentioned, you should always have an account with https://www.icloud.com and use "Find My iPhone" to track your MacBook and iPad
And yes, for all of us, PLEASE never leave anything in your car that can be seen easily. Even if you think the area is safe or who will bother stealing a backpack, think again. I always make it a point to either put things in the trunk of the car or glovebox if you must leave it in your car.