Hotel Reviews:
http://www.tripadvisor.com – Reviews of lodging and attractions
worldwide
Places to visit in the US:
http://www.americasroof.com – High points in each state
http://www.nps.gov – National Parks
http://www.recreation.gov – Recreational activities by type or location http://www.factorytoursusa.com – Factory tours
http://www.sixflags.com – Six Flags theme parks around the country http://www.legendsofamerica.com – Quirky roadside attractions in some states http://www.roadtripamerica.com – For people who want to take the slower route http://www.stadiumsofnfl.com – All about the NFL football stadiums http://www.ballparksofbaseball.com – All about the major league baseball parks http://www.terraserver.com/special/sports.asp - Sports venues of all kinds http://www.themeparkcity.com/USA_index.htm - Theme parks, amusement parks, waterparks, and zoos by state
Campgrounds and RVing:
http://www.trailerlife.com/cforum - Trailer Life Forum, discussion
boards about everything related to camping and RVing
http://www.rvparkreviews.com - Campground and RV park reviews
http://www.koa.com - KOA campgrounds worldwide
http://www.nps.gov - National Park system
http://www.goRVing.com - all about RVing
For travel in Europe:
http://www.ricksteves.com/
Information about states in the US: http://www.50states.com