If you're wanting to work the Mayhem badges, then you need to kill the cops and the mailbox/news/phones/fire H on the way to the bank. Also you'll want to find the Arson side quest for that badge (have to do it 10 times).
Now soloing them is easier, and if you get an Arson side quest, you don't have to worry about someone stealing it from you (only the person who clicked the last bomb gets credit).
Also get the other breakable stuff for the time bonus. But once you get a time bonus for an object solo, breaking more of that object will not give you more bonus time.
