I have a new waterbee 200 pedal boat. The paddles rub and knock against the hull in one spot when rotating making a noise. How can i fix this please, Regards Lido.

What defines a canoe or kayak is not hull shape, load carrying capacity, hull speed, comfort, or ability to handle big water. There are hulls available of both types that excel at speed, comfort or load carrying, for example. There are olympic white water slalom and flatwater (speed) racing events for both, and epic long distance voyages have been made by both, too.
Canoes are designed and built to be paddled with a single bladed paddle, and kayaks are made for double bladed paddles. This is what defines them. Verlen Kruger, perhaps the greatest modern distance paddler, said that he preferred a single blade for all day paddling because in alternating sides it gave some muscles a brief rest, and because the more vertical paddle shaft made for drier hands and boat.
Paddle craft may be the most varied water craft around. Browse around the web or explore your library or visit the Canoe Museum in Ontario, Canada, and you will see an amazing and wonderful variety.

ROTOMOLDED KAYAK CARE
Our "roto" kayaks are made of high-density linear polyethylene, which is virtually maintenance free. A minimal amount of care in storage and transporting will help the kayak maintain a like-new condition for many years.
Polyethylene will become more flexible when in warm conditions such as a hot, sunny day. It is possible for a kayak strapped tightly to a roof rack for a series of days to temporarily deform at the weight bearing points. Use a rigid bar sport rack in addition to a "kayak cradle" to disperse the weight.
COMPOSITE KAYAK CARE
Composite kayaks (PRO models), made of a fiberglass or Kevlar laminate, require a small amount of additional care over rotomolded kayaks. Some sections will be more flexible than others. Scratches or superficial damage can be buffed with rubbing compound and followed with a polishing compound. Gel coat repair kits are also available from your Wilderness Systems dealer for more extensive repairs. Hard impacts may result in structural damage, so inspect your hull after a collision. Inspect the interior of the hull at the location corresponding to the impact. Look for fine white lines mirroring any damage on the outside of the hull. This may indicate a resin fracture. In some cases this may require a composite repair kit available from your Wilderness Systems dealer.
CLEANING
Usually, a quick rinse of fresh water is all that is necessary to keep your hull clean and functioning in good order. This is very important after paddling in salt water, especially if your boat is outfitted with a rudder system. Be sure to thoroughly rinse the rudder, rudder cables, and footbraces with fresh water to remove salt residue. Superficial scratches may occur, but can be removed or reduced by use of a marine boat polish designed for polyethylene hulls. Sanding or use of an abrasive rubbing compound is not recommended. To keep your kayak shining and minimize the long-term degradation caused by UV exposure, use an ultraviolet protectant such as 303 Aerospace Protectant, available at your local Wilderness Systems dealer.
WARNING:
Avoid dragging kayak across the ground to prolong its life and maintain its look and performance. Two people, utilizing the carrying handles, is the best way to transport the boat. Alternately, you can transport using a kayak cart, available at your dealer.
https://kayakfisherly.com/how-do-i-care-for-my-kayak

check the sprocket sometimes they are put together with screws and it might be extruding out and rubbing.

Oilcanning is a fairly common problem usually caused by improper storage or transport of your kayak, especially if it's hot out. Gently heating your hull (either by laying your kayak upside down in the sun on a warm/hot day or by using a heat gun CAREFULLY) MIGHT pop the dent out. If you were dealing with a single-hulled kayak, a little gentle pressure on the area with the dent while it's warm/hot would definitely do the trick. Not sure how I would approach a double hulled kayak, but it would probably be a combination of heat and pressurizing the inside of the hull or heat and water on the inside of the hull...would have to experiment.

Pedal boats are powered by your feet and paddle boat is powered by your hands.

There are paddle boats for children where they use their hands to paddle the boats and not their legs. You can find many types here: http://www.alibaba.com/showroom/kids-paddle-boat.html

The best way to keep your pedal boat is to move your boat into a garage after you use it. You can also keep it on the shore but make sure it is covered. Remember that if you have a plastic boat, water can get in between the hull and the deck. You should make sure that you get the water out before it creates mold.

How weak and how do you know? This is a plastic boat AIUI and it will have some flex. Without examining the spot, I would say it is hard to do much without adding weight or ugly or both. Maybe a criss-cross of duct tape to reinforce if there really is a need, and you can reach it.

hi is the hull made of fiberglass, if so you can normally buy these type of repair kits from car spares shops, they include fibre glass resin and sealer, good look.

in the nose of the boat right next to the handle theres a funny looking switch if you stand the boat on its nose and flip the switch it will let the water out.
But...in my personal opinion it keeps the hull a little lower to the water and the paddles deeper...