Good adventure groups specialise in single people?

Hi, would like to go on a trekking break with an organised group. Would much rather organise it myself but I don' want to trek solo.

Are there any good recommendations for groups that might specialise in treks for solos. The main thing I want to avoid is being on a group with loads of couples!!

thanks

www.trekamerica.com seems quite good! They take all ages round U.S.A, and South America.

For treks in Karakorams we recommend: www.adventure-touroperator.com which provides the best services to individual trekkers and climbers as well as arrange fixed departures for individuals to meet up and make small groups of 4 to 6 trekkers. Their speciality is K-2 base camp trek and climbing in the Karakoram area.

come to Greece! upon arriving buy a map from anavassi (opt for english) and then go by train to climb Mt. Olympus- for instance.