u can prefer any one following

Al Jaber Travels Tours & Cargo
PO Box:16269, Doha, Qatar
Tel:(00974) 4442015

Al Mazaya Tourism
PO Box:15811, Doha, Qatar
Tel:(00974) 6510088

Alpha Tours Qatar
PO Box:9012, Doha, Qatar
Tel:(00974) 4344496

Pearl Tourism Services
PO Box:45677, Doha, Qatar
Tel:(00974) 4357333

Gulf Adventures & Sahara Tours
PO Box:18180, Doha, Qatar
Tel:(00974) 4221888

Qatar International Adventures
PO Box:55733, Doha, Qatar
Tel:(00974) 4553954

Qatar Tourism and Exhibitions Authority
PO Box:24624, Doha, Qatar
Tel:(00974) 4997499