I usually find a trip to the supermarket helps... Some Wellcomes have baby trolleys that they can push themselves, if I choose the products and give them to my daughter to put into the trolley she feels happy that she is helping Mummy.
Initially, I thought it might backfire and she might start grabbing things from the shelves, but after a gentle talking to the first few times that happened all was OK. She now asks me nearly every day if we are going to the supermarket!
Likewise for the post office. Sometimes I didn't really need to go to the post office as I already had stamps, but I found if I explained that we were going somewhere and that I needed her help she would get interested and it would help to pass the time. I let her post the letters into the box and that catches her attention. We walk there too so she burns some energy on the way!
I find that I go stir crazy if in the house for too long, as does she, but I didn't want to feel it necessary to 'entertain' her every time we went out. I figured if she got interested in day to day chores this would help out on a rainy day when Ocean Park wasn't going to be possible....
Good luck xxx