Do I need fancy clothes for dinner?

Most beach towns in Mexico are 'resort casual.' A nice sundress or linen trousers with a polo shirt is sufficient for almost any restaurant.

Is it worth bringing a snorkel mask?

If you plan on doing multiple boat excursions, bring your own mask. You'll get a better fit and avoid the hygiene issues of communal rental gear.

What to Pack for a Beach Vacation in Mexico

Prioritize breathable, moisture-wicking fabrics and high-SPF sun protection to handle the humidity and intense sun. Stick to a 'beach-to-dinner' wardrobe that transitions easily by layering lightweight linens or sarongs over your swimwear.

Select your fabrics. Mexico's coast is humid. Choose linen, hemp, or high-quality synthetic moisture-wicking fabrics. Avoid heavy denim or thick cotton, which will stay damp and heavy in the humidity.
Choose the right footwear. Bring three pairs: waterproof rubber sandals for the beach, a comfortable pair of walking sandals for town, and one pair of lightweight loafers or dressy wedges for dinner. Avoid leather for the beach as it will rot or warp in the sand and salt.
Layer for AC and breeze. Even when it is 90°F outside, resorts and restaurants often blast air conditioning. Pack one light linen long-sleeve button-down or a soft pashmina to keep your shoulders covered indoors.
Pack for sun protection. A wide-brimmed hat is essential. If you don't want to pack one, bring a sturdy sun-visor that can be flattened, or plan to buy a woven palm hat locally at a market.

Do I need fancy clothes for dinner?: Most beach towns in Mexico are 'resort casual.' A nice sundress or linen trousers with a polo shirt is sufficient for almost any restaurant.
Is it worth bringing a snorkel mask?: If you plan on doing multiple boat excursions, bring your own mask. You'll get a better fit and avoid the hygiene issues of communal rental gear.