I only buy waterproof sandals for my kids. In the past I've worn saltwater sandals (too hard), sneakers (expensive) and striderite. They're cheap and hold up well. They are really waterproof and comfortable. My 2 year old can put them on and take them off (which some parents don't like) but it fits me. She has worn them everywhere and they hold up well.
Capezio Girls 3800 Mary Jane Tap Shoe in Caramel - Size 11.5 M Toddlers
49 Review
Flexible Comfort: pediped Flex Isabella Mary Jane for Toddlers and Little Kids
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Slip-Resistant Crib Shoes for Babies: Robeez Soft Soles for Girls and Unisex Toddlers, Ages 0-24 Months
53 Review
Felix Flora Toddler Flower Dress Shoes - Adorable and Comfy Flats
47 Review