We did both Beaches and Cream and the Pepper Market last week. You can check out my reviews in my signature if you want a more detailed answer, by the way.
At Beaches and Cream, there was no additional side allowed, as the entrees all came with sides. At the Pepper Market, there are different entrees, some come with a side and some don't. The ones that don't allow you to get an additional side. I had the wok sampler, which came with an egg roll, so I didn't get an additional side. DBf had the calzone, which didn't come with a side, so he got an egg roll as a side.
Have fun! Beaches and Cream was a GREAT deal for the vouchers. One is definitely enough for two people, even big eaters, by the way.