Sea/Ocean Ashwata tree - should not touch

 Source: Smrutimukhtaphalam

Topic: Samudrasnanam

It says, Ocean(Sea) and Aswata tree are meant for praying and not for touching. 

Aswata tree/Raavi chettu/Arasa maram - can be touched on Saturday.

We can touch sea during parva kaalam. During other times, we should not even touch the ocean with the tip of a dharba grass.

What is Parva kaalam? -  Ashtami, Chaturdasi, Poornima/pournami, Amavasya, surya/chandra grahanam, pushkara samayam.

We can take bath on any day in Rameswaram.