I'd avoid any kind of food items - I've been told a bottle of wine is a good hostess gift, but what if they're in recovery? Same goes for candies, what if they're watching their weight, or are diabetic? You'd probably be safe with a lovely food basket, but that might be impractical to transport.
What's always worked for me is a "gourmet" soap & lotion set. I've picked them up from Bath & Bodyworks and I LOVE the Williams-Sonoma products. (The pink grapefruit scented one is amazing!)