Sunscreen’s a good idea for situations where you can’t otherwise avoid extended sun exposure, but it’s got its problems too. It enables you to spend unnatural amounts of time exposed to the sun, and unnatural is almost always bad. Plus it blocks your skin from absorbing all the sun’s nutrients. There’s also a debate about whether some of its chemicals are toxic or not—if not to you, at least to the environment. And…
To keep wet swimwear, dirty shoes and leaky shower gels separate from the rest of your things. If you bring clear plastic bags, you’ll be able to stay super organised by separating out your clothes into categories (shorts/t-shorts/leggings etc) and packing them in separate bags. It will make things easier to find and will add another layer of waterproofing.
“You can ‘de-materialize’ certain objects by replacing them with apps on you phone. The obvious example is the camera, but also think of the travel guide book, maps, the moleskine, books, magazines, etc. Also, if you are taking a long term trip, you can buy clothing from locals as you go with apps like Modabound (an Airbnb for clothing) and others.”
Along freeways with heavy traffic, carpool lanes (also called “diamond lanes” for the diamond-shape pattern painted on the lane’s surfaces) are identified by black-and-white signs that include details on times and days of enforcement (usually during peak rush hour periods on weekdays). To drive in most carpool lanes, you must at least two people (including the driver) in the car (some lanes in the San Francisco Bay Area have a three-person minimum. Tempted to use the lane when you don’t have the required number of riders? Don’t—fines are staggeringly high, close to $400 in some areas. In the Los Angeles area, carpool lanes may have specific entry and exit zones; adhere to them or you could get a hefty fine.
When you buy the full tank, the price may be close to the going rates locally, but that's not the gouge. The gouge is that you get no credit for whatever fuel remains in the tank when you return the car. Instead, you donate it to the rental company. So unless Avis, Hertz, or Enterprise is your favorite charity, this option is a nonstarter. And when a rental company fills the car, it typically charges two to three times the local price per gallon (or liter).