Yeah, when it rains at HHN, you're basically left with two options:
A) Tough it out and continue on through the houses
B) Stay in a shop or restaurant until it lets up.
Bill & Ted won't go on when the weather is bad, the street actors won't be out, and as everyone has pointed out, the house lines aren't covered for the most parts. The soundstages have some covering in line, but not too much.