Start with the number, because no other guide to this city will give it to you. Measured against the live booking inventory, Biloxi supports roughly eight bookable tour products in total. Not eight good ones out of a hundred. Eight. The median price sits around forty dollars. If you have come from a week in Cancun or Oahu expecting pages of options, this will look broken, and it is not: it is an accurate reading of a working Gulf city with a small visitor economy bolted onto two much larger industries.
There are four structural reasons, and knowing them tells you where to book instead.
There is no cruise terminal here, so there is no shore-excursion market. The whole global machinery of three-hour bus-and-boat products exists to serve ships, and no ships call.
The casinos sell themselves. Eight resorts run their own hotel rooms, restaurants, spas and showrooms, and none of them needs a third party to fill a seat. What in another city would be packaged as a night out is, here, a reservation you make with the property.
The best single experience in the destination is a National Park Service concession. The ferry to Ship Island is run by an authorised concessionaire out of Gulfport, and you book it with the operator, not through a marketplace.
And the fishing fleet has never needed an intermediary. Charters out of the Small Craft Harbor and the Back Bay have taken bookings by telephone for decades, and a great many of the best captains on this coast do not list anywhere you can click.
What that leaves in the clickable inventory is genuinely worth doing, and one piece of it is outstanding: a working shrimp boat that takes you into the Sound, drops the trawl, hauls it in front of you and spreads the catch on a table while somebody names every animal in it. Ninety minutes, cheap, and the best explanation of this coast money can buy. Around that sit schooner sails from the museum pier, short harbour and Back Bay runs, and a handful of fishing trips.
The practical consequence for your planning is worth stating plainly, because it inverts the usual advice. In a destination with three hundred products you book early to get the good ones. Here there is no competitive scramble and very little risk of missing out, so the discipline runs the other way: your job is to avoid buying the same two hours twice. With inventory this thin, a harbour cruise and a dolphin cruise can easily turn out to be one boat on one route under two titles. Read what the trip actually does rather than what it is called, and fill the rest of the week from the free and ticketed things this coast has in abundance.
The other consequence is that the single most valuable booking here is not a tour at all. It is a seat on the ferry to Ship Island, which is transport rather than an excursion, sails only from the middle of March to the end of October, and leaves from a dock in a different city. Settle that before anything else on this page.
The rest of this page tells you what each of those is actually like, what to ask before you pay, and which things you should stop looking for on a booking site and simply ring up instead.