Marley loves dancing, peekaboo, luuuurves the bath and splashing in water, blocks (mainly knocking them over but she has started trying to build them too! lol).
We started reading to DD1 a lot more at this age, and started talking about things with descriptions ("Look at the green block!" etc), playing with toys with wheels - we pull them along and she has a ball walking around trying to grab them.
Swings are a big hit, as is dirt and sand. I usually set up a large mixing bowl and some measuring cupes, tea strainer and things outside on the table and she plays with them for ages.