If you're heading out of Boston and not staying in or near the city, reserving a rental car at Logan

If you only need a car for a short time, Zipcar can save you lots of money because you can rent it just for the time when you need it - and no need to pay overnight parking fees. You can easily pick up a Zipcar at many locations in the city whenever you're avis auto rental ready to use it.
If you're heading out of Boston and not staying in or near the city, reserving a rental car at Logan is a no-brainer - but if you're heading into Boston, a car can quickly become an expensive liability.
And then there's the cost of city parking: some Boston hotels now charge $50/night or mor (plus tax) to park overnight. Daytime garage rates can be equally shocking. A car quickly becomes an expensive liability - especially if you end up mostly walking while you're here.
So before you automatically reserve a Boston rental car for your entire visit, consider taking a water taxi or regular taxi to your hotel from the airport, and renting a car only for whatever time you need one. You'll save a lot of money - and avoid a lot of stress.
The fastest and most scenic way to get from Logan International Airport to Downtown Boston, the South Boston Waterfront, Charlestown, or the North End is by water. Boston water taxis make the trip in about 7-10 minutes, and operate in all but the most severe weather conditions.
There are certainly times when you may need a Boston rental car during your visit. Perhaps avis auto rental you want to attend an event outside of the city, such as a New England Patriots game or concert at Gillette Stadium, or enjoy a day of power shopping at Wrentham Outlets, or visit Plimouth Plantation on Boston's South Shore.
Zipcar is the easiest and usually the cheapest option. Another advantage is that if you're staying in or near the city, you'll usually find a pickup location nearby, including at many hotels. You rent by the hour, and pay for only the time you actually need.
A few Boston luxury hotels provide complimentary in-town car services, ranging from plush sedans to green hybrids. Depending on what you need, this may work well for you - plus you'll get to stay in one of Boston's best hotels.
You'll save a bundle on car rental fees, taxes, insurance, and parking fees by renting a car for only the time that you need it - and you use the money you saved for a wonderful meal in a Boston restaurant.