Is an activity diagram the correct diagram type?

I want to model a workflow with several decisions. Each decision will either terminate the workflow or lead to the next decision until the final step is reached.
I could use a classic flow chart, but I thought that an activity diagram is the UML replacement for a flow chart. I have read that decisions cannot be labeled in activity diagrams, so I am unsure how my diagram should look like. It also seems strange to me to chain mulitple decisions. Is this allowed?
Thanks for your help,