Want to visit Paris or Amsterdam soon? ONE WAY tickets to Paris and Amsterdam from Boston and Baltimore on sale with a stopover in Iceland on WOW Airlines for 99 USD! It's only available one day a week but definitely a steal. WOW airlines is a budget airline so any luggage anything over 11 lbs, you will pay for and the return ticket is about 250 USD. As, as a serial budget traveler make sure you have a ticket to return on WOW Airlines or another airline.
Learn more on USA Today
Visit the WOW Airline website
If you are a U.S. citizen you should always check travel.state.gov before flying to any country. Most European countries including France and the Netherlands allow an American to visit for up to 90 days (that's a long LONG time!) and if you exit the country and return from another country it resets again. The major important issue is always have an on going flight ticket to leave the country you land in or a round trip ticket already booked back to the U.S. at a later date because the departing airport may not let you board the flight.
Below is some of the visa and time limit information for the Netherlands and France from the U.S. State Department website.