North America
USA - New York City , Las Vegas, Washington DC, Boston, Los Angeles, Honolulu, New Orleans, Miami, Seattle, Sedona, San Francisco and Chicago.
Canada - British Colombia, Montreal, Niagra Falls, Toronto, Quebec and Banff.
Asia
Japa - Tokyo
Thailand - Sea Kayaking and Bangkok
Nepal- Mountain Trekking
India - Goa if you like beaches and few places like Gir Forest and Ranthambore
Cambodia - Angkor
Europe
Greece - Acropolis of Athens and Santorini
Italy - Cinque Terre, Rio Maggiore, Rome and Venice
Germany - Neuschwanstein Castle
France - Sea Cliffs, Etretat and Mont-Saint-Michel and Nice and Cannes and Chamonix
UK - London and Woolacombe Beach
Spain - Barcelona and Playa de las Catedrales
Russia - St. Petersburg
Netherlands - Amsterdam
Austria - Viena
Africa
South Africa - Cape Town
Zimbabwe - Victoria Falls
Kenya - Nairobi
South America
Brazil - Rio and Sao Paulo
Peru - Machu Picchu
Columbia - Cali
South Pacific
Australia - Sydney, Cairns and Surfers Paradise
Middle East
UAE - Dubai
I'd recommend Mazatlan, Sonolor, Mexico. It's a really beautiful place and it's fairly cheap. You mentioned you like to go on adventures and nature, this place is by the ocean with mountains and hills. I'm sure you can find some kind of adventure. It's a great relaxing place for you to get away. In addition, there are other food, not just seafood. They're fairly cheap. It's probably one of the cheapest places you can travel outside the U.S.
Good luck! You may want to google search this place and just to get a better idea.
I recommend Hohenschwangau Neuschwanstein Castle
for more info check this
http://hohenschwangau-neuschwanstein.blo...
what about somewhere like indonesia or bali?