You can find information on galapagos tours at a travel agency of your choice or an online website. For online you can visit websites such as discovergalapagos.
One can find information about the Galapagos Islands on the official Galapagos Island's website, EcuadorExplorer, Exodus, LonelyPlanet, WikiTravel or Wikipedia.
There are a wide range of sites that offer information regarding Italy tours. Some of the sites where one can find information are Rick Steves', Perillo Tours, and Tours-Italy. There is also a wealth of information available on the Tripadvisor site.
If you are looking for more information on Asian tours you can try contacting a local travel agency for more information. You can also try contacting the company About Asia Travel.
You can find more information on whale watching tours by getting in contact with a travel agent. Agents in areas that offer whale watching tours (Such as British Columbia, Canada or the San Juan Islands, Washington, USA) will be more helpful than those that are not familiar with such tours. One company that offers tours in WA is Western Prince. Their phone number is 1-800-757-6722
I checked out tauck tours with the better business beaureau for you and I haven't found any complaints. I also found a website where you can find out more information its www.tauck.com.
Saga holidays are a UK based company that run tours for people aged over 50. You can find information about their tours at your local travel agent or on their website which lists all of the information you need to know before you books.
There are many wineries in the Napa Valley area, and the best way to visit multiple wineries is through a wine tour. One can find more information about these tours on the California tourism website, and also through the websites of Platypus Tours and Wine Country Limos.
According to the USA Today, Grand European Tours, Elderhostel: Road Scholar and Grand Circle Travel operate some of the more popular senior European tours. You can get more information at the USA Today website: http://traveltips.usatoday.com/senior-tours-europe-18170.html
One can go to the following websites to find more information about Rhine River cruises: Viator, Avalon Waterways, Scenic Tours and also Travelsphere.
Cinque, Italy offers many opportunities for walking tours because of its beautiful hiking tracks and beautiful environment. To find more information on what walking tours are available you should look on Tripadvisor.
One may find more information on Peter Russell at his official website and through Wikipedia. A complete listing of his written works and public speaking tours may be found.
Given that your parents have a hard time walking, you should check into tours targeted at the disabled. Here's a blog that will give you more information on these types of tours in Paris specifically: http://www.colleensparis.com/blog/links/sightseeing-disabled-travelers-and-wine-tours/