Nuevo Vallarta is a very good place to relax. It is very peaceful and it is not so crowded and noisy like Puerto Vallarta. Also, the beach in Nuevo Vallarta is nicer than the one in Puerto Vallarta, so I recommend it more if you want to take a swim or go out with a kayak.
Quick Tips:
I checked out almost all the resorts in Nuevo Vallarta and after staying in the Grand Velas Resort, all the other ones didn't look so nice.
I really suggest that even though you don't stay in the Grand Velas that you make a reservation to go to one of the restaurants on site. The Frida (Mexican-French restaurant gourmet style) or Lucca (Italian cuisine)--these restaurants are very, very tasty and the service is excellent, so I highly recommend them.
If you've never been to an all-inclusive resort or you don't like resorts that are all-inclusive, Grand Velas will change your mind - it's a great resort with an excellent quality, in food service, and all the facilities.
The all-inclusive fee per day per person is and I think it's worth it, because you get room service, any drink you can think of, staff friendliness and the best resort in the area.
This will be my first option when I go to Puerto Vallarta!
Best Way To Get Around:
The best way to get around is in a taxi. It is kind of expensive but it's the only way you can go to Puerto Vallarta or visit other locations. The taxi charges to take you to the resort, but you arrive there very quickly, in about 10 minutes.
A walk on the beach before sunset is very nice. It's not crowded, so it can be very romantic. Take a lot of sunscreen because after a few hours your skin will turn black and then it will be itchy all over.