updated 04/02/2013 AT 10:30 AM ET
•originally published 04/02/2013 AT 10:45 AM ET
Neil Patrick Harris has embarked on the ultimate adventure – except he’s got no idea where he’s going.
The How I Met Your Mother actor is currently on a cross country scavenger hunt put together by his partner David Burtka for his birthday three months early.
The celebration began on Saturday with a surprise party for Harris – who will turn 40 on June 15.
Then on Monday, Harris was driven to Las Vegas, where he trained with Cirque Du Soleil performers at Shine Fitness.
Wearing full on Cirque-style makeup, the actor performed a choreographed acrobatic routine.
He later, Tweeted, “My b’day is 6/15. @Davidburtka threw a surprise party for me on Saturday – blown away. I’m now on some lengthy treasure hunt that is unreal.”
Neil Patrick Harris (@ActuallyNPH) April 2, 2013
– Mark Gray
— People magazine (@peoplemag) August 7, 2012