ppn says that shanimuni paradise wasn't performed at this concert - http://wiki.theppn.org/Hello!;_Project_2008_Summer_Wonderful_Hearts_Kouen_~Hishochi_de_Date_Itashima_Show~
I'd figure that since they aren't all that sweaty at this point, it must be near the beginning of the show. The only options for group performances at this point are the first two songs:
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