They are open for public

http://www.dowslake.com/summer_rentals.php

They range anywhere from 18-30 I believe depending on the size you get

No

Yes they do! They rent an assortment of boats!

Children's skate trainers are around $9 flat rate I believe. Just head into the Dows Lake Rental Hut (big trailer) and inquire with them. You will need a piece of photo ID and payment (deposit required for rentals).

Yes

I can concur with above. Have a good night!