One of Naomi's recent favourite activities has been hiding in a den of some kind. As it's easy to do, we've mostly been using her baby gym with a blanket over it for this. She really likes sitting in there playing with dolly, or the spider toy that's a part of the gym. It also combines well with the hiding / seeking / chasing which she's really keen on just now. It's quite fun to watch her dive into the tent, then peek out again!
She's also getting very good at communicating what she wants. For this activity, that means pulling on the baby gym (which we keep tucked behind an armchair) until it falls out, or a parent is kind enough to remove it for her.