People in Oman are undeniably friendly, hospitable, and courteous, and it's only polite if you reciprocate the same. Learning a few local greetings could definitely make your Oman experience more delightful; kicking off a conversation with an "as-salam alaykum" and getting back a "walaikum as-salam" could really go a long way. The everyday handshake is pretty common in Oman, among men of course, and it's vital that one should not initiate a handshake when greeting an Omani of the opposite sex. More often than not, Omanis of the opposite sex wouldn't be interested in shaking your hand, but don't be offended though, they are not being impolite but keeping with their cultural values.