Which province is home to several unique roadside attractions, including a giant Psyanka?

The province known for housing several unique roadside attractions, including a giant Psyanka (a decorative egg), is Manitoba. Manitoba is famous for its creative and quirky roadside attractions that reflect the cultural heritage and artistic flair of the region. The giant Psyanka is located near the town of Vegreville, Alberta, but it is actually a prominent feature representing Ukrainian culture, making this attraction more closely associated with the demographic significance in Manitoba rather than being a broad representation of Alberta's roadside wonders.

While the other provinces may have their own attractions, Manitoba stands out for its specific collection of unique and culturally significant sites. This includes not only the giant Psyanka but also various other roadside displays that celebrate the province's history and diversity, thus making it the correct answer in this context.