Sit & Stand.

So, when baby #3 arrives, baby #2 will be 5, almost 6 years old.

Mostly, he's going to walk, but we live in Florida and like to hit the theme parks. For that reason, I'm thinking about a sit & stand.

BUT, I don't want this huge bulky long stroller, if 80% of the time it's just for Baby.

I thought about getting a separate attachable buddy board, for him to stand on at parks, but I feel like it'll be awkward or unbalanced. And, I'd like him to have a seat option. Any thoughts on the most single-sized sit & stand stroller that doesn't feel like it's too big when you have no Stander?