Camping. Absolute best.
Prior to this, I'd only done MDMA at raves and clubs- but the setting of feeling the sand, looking at the mountains, feeling the river water, the campfire, the close friends, the moon and stars, and the brightness of the light shows in the pitch blackness you get away from the city (brought gloves, of course) felt far more indulgent and natural than dancing around a bunch of strangers and spending 5$ for a water bottle from a bartender. People brought their doggies too, which are even more fun to cuddle and play with when you're rolling.