Snorkeling equipment may be provided free, rented, or bought inexpensively in tourist areas, so there's no need to bring any from home.
Don't bring your own snorkeling equipment because it's cheap to buy or you can rent it.
The gateway to the gardens of the mausoleum can be admired as a masterpiece in its own right, with noble marble arches, the domed kiosks on the four corner turrets, and two rows of 11 small chhattri (umbrella-domes) just above the entrance.