Jax and Rock N Road Cyclery both rent high end bikes (I don't know how close their shop is to you /Long Beach). There are tons of places on the beach that rent beach cruisers.

Call in advance to make sure that they have your size bike in stock at the store you want. Then call the day before to make sure that your rental bike is physically in the store.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle