My DS is quite physical - anything he can climb on/over/under etc. He loves the sandpit/his sand and water table. He loves our prams/trolleys to push and pull and load up with stuff.
He's currently sitting up at the table playing with playdough - well actually mainly with the container and putting the playdough in and out. He like to draw on the chalkboard too. He isn't allowed to have penxils inside as he's a wall drawer.
The other day I gave the two of them some shaving cream on the table and some food dye and let them play in that - they loved it and then we took 'prints' of the result. They got it everywhere but it was easy to wash off ( it was outside). Then they spent the next half an hour standing in the shower recess with cups and straws and blowing bubbles.
DS loves to chase bubbles that DD loves to blow, so that is a good game.
Painting with plain water is good when it's warm - give them a brush and a bucket.
Arimeh started a thread a while ago - lots were for older kids, but there was lots for younger ones as well.