Answer: Tomatoes require about the most sun of any garden vegetable, so if you've been getting a good crop of those, then you should be able to plant any of the others you mention. Snow peas like cool weather, so plant them early--they may even appreciate a little shade once the weather warms. Leafy vegetables like lettuce, spinach, and some herbs, generally tolerate shade better than fruit-producing plants like tomatoes and peppers. If there's any place in the garden that gets more sun than other spots, I'd put the tomatoes and squash in the sunniest spots. I think the beans will do well anywhere in the garden.
Is there anywhere you could set up some containers in full sun? Tomatoes adapt well to container-growing, and will appreciate the full sun. Good luck!
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