Since you can get a drink nearly anywhere in the WS, and are not limited to where you can go with it inside the park, select your beverage of choice and then sit outside the Rose and Crown in the public seating area.
Or, you can sit anywhere around the lagoon for that matter.
Get some champagne at France and select a bench there, or stand on the bridge.
Get a drink at Germany and wander up to the Outpost and sit at one of those tables (or pick up a drink at Norway for that matter).
No matter where you want to be, if you want to actually sit at a table on on a bench, you are most likely going to have to be early. Folks start holding the choice spots around eight p.m.