A lightweight mat (this one weighs 2 pounds and can fold up small enough to fit in your purse!) is the surest way to maintain a yoga practice, even on vacation. All the better if your sun salutations make it beachside.
Joe Fresh French terry swim cover up ($29). Free People swimwear ($98 each). Gaiam cotton and spandex dual-grip headband ($10). Manduka biodegradable rubber eKO SuperLite Travel mat ($45 at Sporting Life). Nike synthetic, jersey and Phylon slides ($30).