I love swimming with Izzy - we haven't been for a while but it's great. I think what you are doing is fantastic and really, just day to day play, and you doing your regular things around the house but including her is enough IMO.... I know she is a bit older but Izzy helps me push the washing basket into the spare room, pulls washing out, we count socks, sing silly songs, chat in her jibber jabber, and just generally talking about what you are doing (cooking, cleaning) are things she will learn from.

ETA - A few other things I thought of! Getting different cd's of music and using instruments, we have rice shakers, plus maraccas and tamborines. Dancing to music. Going to the park and putting her on the swing and slide etc...naming animals and plants.