My in-laws just signed a lease on a beach apartment! We live about 9 hours away, but we're planning on taking several trips to visit this summer. I have never gone to the beach with an infant, so I don't know what I need. He's 3 months old right now, so he'll probably be 4 months the first time we go. Does he need something like this?

http://www.amazon.com/Coral-Protective-NoZone-Fuxia-months/dp/B00697X0MS/ref=wl_it_dp_o_pC_S_nC?ie=UTF8&colid=3KB5MLJNFVEJ9&coliid=I3PHAFZIN374P1&psc=1

Or is that unnecessary at that age? Will I just want to keep him in the shade the whole time? Speaking of, what should I get for that? A big umbrella? A tent?

We're not planning to put him in the pool, but maybe the ocean. So would it be cool to just take him naked? Or do we need swim diapers?

I'd love it if you'd tell me what you needed and what you could've done without when you took your infant to the beach. Thanks!