What kind of cooler should I get if I want it to double as a table?

Get a rotomolded cooler with a flat lid, like Yeti, RTIC, or Pelican. The lid needs to be flat and strong enough to stand on, not hinged to flop open. Check for a flat surface without indents or cupholders, and rubber feet to prevent sliding. That way your beer stays cold and you don’t need a separate table.