Except for a storm that keeps Tally and David camping for three days, they make pretty good time to the city.
Once they're in the city, it's Tally who gets to be the guide. ("Here's where to get the best hot dogs, here's where they give you brain damage," etc.)
They go to see Special Circumstances, which is protected by a fence—well, "a sensor wire" alarm (63). But Tally and David come up with a plan to ride their hoverboards far over the top wearing bungee jackets.
So this is how fun little tricks turn into revolutionary actions.