Don't worry about your zucchini plants.  The first blossoms are male; female flowers are later.  You will probably get a lot of fruit later. Photos would have been helpful regarding your tomatoes. If tomatoes are wilting, usually it is a lack of moisture or a problem with the root system. However, if they are overwatered, the leaves also wilt. In all cases, the problem is at the roots. I can only suggest that you dig down around a plant or two and see what is going on. Are the roots firm and white or soft and mushy. If the latter, that is too much moisture. Depending on your soil and any amendments you have used and whether the amendments were mixed in or just put on top, that also is a factor. Here's a link to a couple more possibilities: http://www.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/plantwilt.html and another on growing tomatoes:http://www.extension.umn.edu/garden/yard-garden/vegetables/growing-tomatoes-peppers-and-eggplant/