There's a very good reason that Toontown and Bug's Land only have one way in and out, it's easier to keep an eye on the little ones and let them run around. Keep both in these, comparatively safe nice cul-de-sacs.
Get rid of Francis Boogie (a low capacity, poor man's teacups) and put in a nicely themed young kid's non-water playground in its place along with adjacent sit-down area next to it (that is perpetually closed and blocked off by bunches for some strange reason).
Extend Heimlich's Chew Chew Train and make it a more substantial ride. I like the idea of giving it a dark tunnel area for a while with a Mantis magic show or ant colony, etc.
DCA already has a kiddie freefal, the Jumpin' Jelly Fish. It could be moved and rethemed to a Bug's Land, where it would be a nice addition.
Tuck and Roll's bumper cars are too slow but they won't speed them up due to liability. They could still plus up the ride somehow to make it something beyond simply bumper cars. We expect more from a Disney ride.