1) Pray
2) read the bible
3) fast
What else can be done, barring turning into a schema monk and giving up everything.
1) Talk to God about everything. Tell him your joys and sorrows. Tell him jokes. When my dad was young he commented to God that he thought his co-worker had the car he would most like to drive out of all the cars on earth. The next day the co-worker offered it to him and for a price he could afford.
2) Really take a moment to listen when you ask God a question. No, he doesn't always answer this way but often words or concepts will suddenly come to mind from somewhere other than you.
3) Whatever you are doing, invite God in.
In college there was a student speaker who spoke of the day he had a snowball fight with God. He declared that he could get God easily because God is everywhere, so he threw a snowball at a sign and said "Got you!" Suddenly a tree he was standing under shook and dumped its snow all over the guy. I guess that "God is everywhere' thing goes both ways.
Once my family invited Jesus along to the beach. Meanwhile, my mom had brought along a floaty we didn't want any more. It turned out it was just what a mother with some young children really needed that day.
I've even dealt God in, in a hand of Apples-to-Apples. You just have someone ask Him which one to put in then draw one without looking. For the chooser, whichever one is unclaimed by others is God's.
Really though, it isn't just silly. Activities are often more meaningful and blessed when you invite God in. In fact, just yesterday, my roommate and I invited God along on our day trip to the next town. Before we even got to our destination God had lead us to pray something life-changing for a virtual stranger and revealed some of the behind-the-scenes stuff HE has been doing on my behalf for the coming season. We then had a couldn't-have-planned-it-that-well good day, such as having a street market open up next to our restaurant, perfect weather, and discovering an awesome view spot on a floating dock to sit and chat that didn't even require my elderly roommate to climb the dreaded stairs in the vicinity.