A danger to himself...and others!!

This kid is crazy!!  Makai is now 20 months and a bone head at times!  He has a very intense personality.  This is a picture of Makai on a swing at the park.  When we get to the park he runs to the swing and swings until HE is done!  If I ask him to get out and he isn't ready the response is, "No, no, no!!" as he shakes his head back and forth.  He doesn't say it mean, he just says it in a way that is sure to get his point across. The past few weeks he has a few habits that are driving me crazy!  One I will mention.  He can't keep things out of his nose.  This week I've pulled out:  several legos, a rock, a piece of paper, a button, cereal...you get the picture.  I've been working really hard to get every 'little' thing(mostly legos) up and out of the way so they wouldn't go into his nose.  Well, today while I was busy cleaning the kitchen after breakfast he went over to the box of markers, took out a marker, bit the top off of it, and shoved it up his nose.  This was a broad tip marker so it was pretty big.  When I came down stairs I didn't realize what he'd done and honestly thought he'd just bit off the tip.  I took him to the bath(again, he'd already had his bath for the day), but as I washed his face his nose kept dripping red, and I knew it wasn't blood.  URRRR.  I went and got the tweezers which now sit out on my dresser for my daily fishing trip in his nose, but he had pushed it so far up I couldn't get it.  I had to enlist the help of Monty who thankfully is super strong  and was able to hold him down while we got it out.(He tried to get it out while I held him, but I couldn't keep him still enough.  It took a while, but finally we got it out.  He was pretty upset and after his bath he let me know by throwing up all over my church clothes and his.  I thought the lesson was learned, but tonight I caught him trying to put his french toast up his nose!  I have no idea what to do.  Like I said, this boy is humbling me!!  None of the other boys ever did this!!  He is also into hitting.  I watched at the pool this week as he hit a friend of ours little boy for no reason at all!  Today he slapped me across the face.  I was totally surprised by it because it hurt and he hit me with no reservation or warning.  This doesn't worry me too much because my other boys went through this stage too, however, the 5th time I'm less kind.  I slapped him back, not hard, but it got his attention.  He looked at me in shock and now we are working on "soft".  Boys...such rough creatures!
  He is kind of fun though sometimes.  Things he does that I love include always saying, "More please" whenever he wants more to drink or eat.  He also loves to run up behind me and stand right behind my back and have me say, "Where is Makai?"  To which he'll peek his head around and say, "There he is!"  He is also fun to read to.  He's just absorbing everything at such a fast rate.  It's fun to hear him try to say things like elephant, crocodile, pumpkin....  I love when he's napping because I know he's safe behind bars(although anything within arms reach isn't.  He's gotten Tyler's glasses a few times as Tyler's dresser sits next to Makai's bed, but thankfully they have always been fixable).  He is sleeping through the night and goes to bed like a champ, so I've got to give him that.   
I think this age is so much work!

We love you Makai, you are just a danger to yourself...and others!!