No boating or swimming is allowed in any park owned by the city. Provided, however, that kayaking, canoeing, and non-motorized watercraft are allowed on the east pond in Riverside Park. Provided further, that any kayaking, canoeing, and water craft must not be propelled with a motor and only in a kayak, canoe, or non-motorized watercraft which is shorter than 14 feet in length and with each occupant of the kayak, canoe, or non-motorized watercraft wearing a life jacket at all times they are on a pond. In addition, all persons under the age of 18 must be accompanied with an adult while on the pond. No swimming, tubes, inflatables, or other devises shall be allowed on or in a pond. Fishing is permitted in the ponds at Riverside Park, subject to the applicable regulations of the state.