Is there a reason that you're in Garden Grove rather than the RI Maingate on Clementine? We have three kids (then 2, 5, and 7), and we walked from there with the younger two in a sit-n-stand stroller. We walked back in the afternoon for the little one's nap, too, before returning for the night. I lost five pounds (that I needed to lose) doing that for 10 days!
I'd like to read others' replies to your question as I have a similar issue for our August trip. I am blanching at paying $229/night for the RI after paying only $151 last October, so I keep looking for other options. We have a reservation for a family suite at the Tropicana on Harbor for $189/night, but there's no good, hot breakfast there. You would think that it being much closer would be enough of a boon, but is it? $40 can buy us breakfast, but I am worried about it being inconvenient and taking too much time to go out somewhere every morning. When we stay at RI, we really whole hog the breakfast, getting lots of protein, fruit, and milk and juice (and coffee for DH) to power us through the morning, so saying we can grab a danish is not the same at all. I pretty much skipped lunch because I was still full from breakfast, although the kids needed lunch.
How vital is a suite to you? We *have* to have one because our kids need the darkness and quiet to go to sleep in a hotel, so we need a separate room if we want to be on the laptops or watch TV. So a lot of closer options are out for us. Is it the same for you?
So perhaps people who have stayed both further away and on Harbor could say how much of a difference the proximity makes? Anyone know of a good breakfast buffet or where to get a hearty breakfast quickly?