Can anyone share information about a vacation to Cuba?

I’m going to be in Mexico, and my friend and I are thinking about taking advantage of this to go to Cuba (since we’re Americans). I have found that I can’t search for flights to Cuba from the US, despite originating in Mexico. Any tools for finding these flights online?

Also, can you recommend accommodations? Stuff to do? We’re just barely not students but still travel on a student budget with our big backpacks.