Things required for nice beach experience [closed]

I am travelling to Goa this October. This is my first time to any beach and I am not sure what should I keep in my bag and back pack to be ready for nice beach experience. My friends told me few suggestions:

Beach blanket
Slippers which doesn't comes out easily (Image below)

Is there any other advice related to beach travel? I am also expecting rain/showers during my travel.

Accessories/things I've and I use to carry while travelling: (May assist you while advising me)

Nikkon 3300 DLSR (IPX1 level protection against water)
OnePlus One SmartPhone (Which doesn't seems to be water resistant or water proof)
Dell laptop (Not at all water proof)
leather purse (hard cash, credit/debit cards and govt. id proof)

I would appreciate if you can share any advice regarding Goa also.