Any fun things to do with my LO

LO is going to be 3 months June 14th, he holds his head pretty good, i put him in his gym and we do tummy time, i put him in his bouncer and let him watch a little t.v and i put him in his swing ... we go for walks but it is raining today ... any other fun brain developing activities we can do ?

I love this site.
http://www.productiveparenting.com/default.aspx
It has activities for every age

Have a "bath" at a different time than normal (if you have a bath/bed schedule), and just focus on playing instead of washing! Help baby splash, squirt water on baby's belly, etc! Fun fun fun! Or get a cheapie kiddy pool and have a mini swim-session outside! Just put a little bit of (make sure it's warmish!) water in it, not too deep, and use baby's bath seat, or hold baby up! Water play is so much fun for babies!

Quoting Jenni Dill:" Have a "bath" at a different time than normal (if you have a bath/bed schedule), and just focus on playing ... [snip!] ... it's warmish!) water in it, not too deep, and use baby's bath seat, or hold baby up! Water play is so much fun for babies! "

yes ! i am planning to get a kiddie pool and when summer comes sit in the little pool with him and play in it !

read some picture books. or show pictures of family and say "mama" "dadda" "grandma" grandpa"....
hold up different objects and say what they are. like shoe, spoon, book....
they absorb so much information even if they look like they have no clue.