My son is just over 5 weeks old and is more awake.
mine just hit 4 weeks. at this age,you are the most entertaining thing ever :) Talk to him, sing to him,dance with him :)when Piper was around this age, we would spend half the day on her shag rug (i tthink it tickled her and she loved it) and just "talk" and kick.find different textured fabrics and rub them on his leg or arm. hours of fun. hehe
right now everything is completely amazing, so have fun :)
oh, not exactly playtime, but my very favorite thing to do with Ailey is take a bath with her. it's so so so so so much fun to watch her "swim" around in the water. expect to get peed and pooed on at some point when you do this, so if dh is home to take the baby and you can just stand up and take a shower and clean up afterward, it's much better;) lol
you could try the E.A.S.Y. method from The Baby Whisperer.