(a) Get yourself a nice bright, warm-but-not-hot day
(b) Bring friends
(c) Park yourselves on under an umbrella outdoors at Mac's
(d) Order a nice crisp wine, some Happy Hour (3-5pm daily) Oysters ($1/per!!) and a couple of sushi appetizers.
That's there's a recipe for some great, chill downtime.
Staff is very friendly and helpful, the service fast and efficient and the setting is fine - even if the surrounding views are somewhat charmless.