The best replacement for activity diagram is flowchart.

The best alternatives to activity diagram are rated as following:
★★★★★  flowchart
★★★★★  sequence diagram
★★★★  state diagram
★★★★  data flow diagram
★★★  use case diagram
★★★  use case
★★  bpmn
★★  workflow diagram
★★  state machine
★★  process diagram
★★  statechart
★  class diagram
★  constraint
  state chart
  process flow
  state machine diagram
  dfd
  statechart diagram
  flow chart

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activity diagram
flowchart
sequence diagram