Musandam is a governorate of Oman, so both trips cross an international border, and both need your original passport: our tours accept neither a copy nor an Emirates ID.
Oman's foreign ministry lets citizens of more than 100 countries in without a visa for up to 14 days, in two lists. The first includes the UK, the US, Canada, Australia and every EU country. The second, which includes India, Egypt and Jordan, applies only to people who live in, or hold a valid visa for, the US, Canada, Australia, the UK, a Schengen country or Japan, or who live in a GCC country in a profession that qualifies. GCC citizens need no visa at all.
The exemption also asks for a passport valid for at least 6 months, a return ticket, a confirmed hotel booking, health insurance and enough money for your stay. If your nationality is on neither list, you need a visa: the Royal Oman Police eVisa site has a wizard that shows which visas you can apply for, including as a GCC resident.
On the UAE side, the federal identity and ports authority (ICP) collects an exit fee from residents and visitors who leave by land or sea; UAE and GCC citizens are exempt. Our Khasab tour's price does not include it, or any Oman visa.
Check your UAE visa as well. Dubai's GDRFA grants its single-entry tourist visa for a single visit, and neither of our tours takes holders of a single-entry UAE visa.