My friend has a large garden, as well as a piano, as well as a great bed.
「もあり」は as well as で言えます。
これが自分の何かに対して(そんなにたくさん!)という気持ちを表す表現になります。
例文 Japan has an interesting culture, as well as great food, as well as beautiful scenery.
「日本は興味深い文化もあり、美味しい食べ物もあり、美しい風景もあります。」
参考になれば幸いです。