Kayaking will obviously not require same type of footwear that you would wear to store or on street. However, since you will not always be in kayak (eventually you're going to have to come back to land and get out of it), you'll probably want to have some sort of shoes just in case you have to come back to a rougher part of beach. You don't want to hurt your feet just because you have been in a kayak.

Something to keep in mind about regular shoes, of course, is that they tend to be fairly heavy. Therefore, if you end up using a regular pair of shoes, you will probably be adding unnecessary weight to your feet. Part of reason that you're adding extra weight is that regular shoes do not repel water in same way that water footwear would. The other down side do this is that your regular shoes will also not dry out very quickly at all. In fact, you'll probably be stuck with wet shoes for a long time after you finally get done kayaking.

The degree of side cut on a snowboard does effect its performance on hill. The side cut radius is size of circle that is cut out of your snowboard. To put this into perspective, most skateboarding ramps have a radius of 9' and professional ramps as seen on TV will have a radius of 11'. As you can imagine, there is a definite curvature to snowboard but it is subtle enough that it isn't always easy to spot.

When a person first thinks about side cut they may feel that it is a ploy by manufacturers to reduce materials and thus cost of producing snowboards. This can not be further from truth. To understand side cuts you must think of why map of world has slices in it. A flat object can not proportionally represent a round object. For this reason a snowboard with a curve, or side cut, can turn faster and more aggressively than a snowboard that is straight along it's length.