I have an exposed, outdoor deck . I want to use this space more this Spring + Summer --- while attending my 3 yr old. I'd like to have some sort of covering to the actual wood deck -- I'm worried about splinters + a softer landing.......and in case, he brings outside a toy.......he can push it along the surface. * I would NOT install anything PERMANENT --- for several good reasons. I'm thinking something I can roll out + roll up since I don't want moisture accumulating under anything. * I already have childproof sides/rails -- * I just need something for maybe, an hour on a nice day - so he can be outside with me. * Anybody have some ideas ?