Nice place with good food. A tad on the pricey side, tho. The service is consistently excellent. They have indoor and outdoor seating. Sushi Siam is very clean and tidy inside. There are other locations around Miami, but I have only eaten at the one at Morningside.
While they are a regular sushi place, and do serve meat dishes, they have a very wide variety of vegetable selections -- including several different types of tofu. I always get a tofu/vegetable dish, which is in a light and delicious sauce. I also get the most delicious vegetarian spring rolls. If you eat egg, there's a little egg thing with rice in it that is DELICIOUS. But, I have forgotten what it's called - it has a little sweetness to it.
I like the place; nothing bad to say at all - there's plenty for a vegetarian to eat.
Cons: Serves meat, Little pricey