Books! Books books books. My DD is going through the exact same thing - transitioning to one day sleep and I am struggling a bit with activities too. Not helped by the large preggie belly and my inability to be very active with her...

But she does love books. She will pick out her faves for me to read over and over again.

We tried crayons too and she ate them, LOL.

How about playdough? DD loves squishing it and smashing it and pressing little cookie cutter shapes into it.

Also flash cards are good - you can buy pretty ones with pictures and a box, DD was given a few sets for her first birthday and she loves pulling them out of the box one by one, then finding ones she knows and presenting them to me.

Also music - we bought a CD with nursery rhymes on it which she dances too, a bit more interactive than TV!

The other things she is loving ATM are blocks - specifically Mega bloks, which you buy from Target, hers are a set of blocks in a zipper bag, she loves tipping them out of the bag, then putting them back in and trying to do up the zip.

Good luck!