In keeping with Daylen's sig, I'll point out that the law requiring a permit to carry concealed or in your vehicle is Code of Alabama 1975, 13A-11-73. If someone asks you what law makes it legal to OC in Alabama, point at them and laugh. (Well, don't really do that. Just inform them that that's not the way the law works in Alabama.) OC is a constitutionally protected right, confirmed by the AL Supreme Court in
State v. Reid, and no laws can be made restricting it.
Also remember that OC is unquestionably legal on public property and public highways, and any property you own or have under your control (such as your hotel room, although I don't have case law to back that up beyond common law castle doctrine). There exists a manufactured "gray area" when it comes to private property, so you might want to avoid that. Remember that under Alabama law, a business owner can ask you to leave for any reason and you must comply or face charges for trespass. Signs that say no firearms are, in effect, notice of intent to trespass anyone carrying a firearm, but don't carry weight of law beyond that. Signs or policies restricting guns on municipal public property, like city parks or city beaches, are illegal under CoA 11-45-1.1 but you can expect they will be unlawfully enforced because Alabama's preemption law doesn't really have teeth.
That's the highlights, anyway. Enjoy your trip!