Tomar, being divided by the Nabão river, features several companies offering kayaking trips, an incredibly fun idea! The most interesting trips in kayak are those to Constância and the Almourol Castle. The average price for this activities is around 15€ per person.
Portugal Travel is an organization of Portuguese agencies whose objectives are:
Escola Superior de Hotelaria e Turismo do Estoril
Turismo de Portugal