Activities to keep 3.5yo and 8mo happy

[DIYandEatCake]

I'm after some ideas please! I'm finding it difficult to find things to fill the days that both dd (3.5) and ds (8mo) enjoy. To tell you more about them, dd loves imaginative play, crafts, playgrounds, water, having my undivided attention (ha ha). Ds has just started crawling, eats everything he can get his hands on, likes eating, trashing his sister's duplo models, and playing peekaboo/singing games etc.
I just can't seem to keep them both happy at the moment - I'm after inspiration.

[JiltedJohnsJulie]

Haven't got many ideas sorry, we seemed to manage on a daily dose of playgroup/library/baking/meeting friends.

Hopefully someone will be along soon