All regional tour operators in Orange Walk [1], Corozal [2], and Belize City [3] offer tours to Lamanai [4]. Ask about night safaris, bird-watching tours, and sunrise trips up and down the New River [5]. Most hotels can arrange tours with licensed guides. Most tours include entrance fee, drinks, and a catered lunch as part of the deal; prices range US$40–60 per person.
Freddy Gomez, owner of Transport Services (21 St. Peters St., tel. 501/322-2037 or 501/609-9641), has a 15-passenger van and a Crown Vic and is a highly knowledgeable guide who can arrange insightful tours anywhere in Orange Walk District. Elvis Usher (tel. 501/669-6686, elvisusher31 [at] hotmail [dot] com) is another notable guide and is available for group or private tours.
Jungle River Tours (20 Lovers Ln., tel. 501/302-2293 or 501/615-1712) is the oldest operating guide service, with a reputation for giving the best tours of Lamanai. Jungle River boats leave from a landing near the historic La Inmaculada Catholic Church.
Errol Cadle Eco Tours (errolcadle1 [at] yahoo [dot] com) is a top-notch guide service and will cater to travelers who wish for a less frenetic pace when it comes to their boat trips; meals and drinks are provided.
Lamanai EcoAdventures (tel. 501/322-3653 or 501/610-1753) also has a dock just south of the Tower Hill Toll Bridge, as does New River Cruises.
Links:
[1] http://www.moon.com/destinations/belize/northern-belize/orange-walk-town
[2] http://www.moon.com/destinations/belize/northern-belize/corozal-town
[3] http://www.moon.com/destinations/belize/belize-district/belize-city
[4] http://www.moon.com/destinations/belize/northern-belize/lamanai-archaeological-zone
[5] http://www.moon.com/destinations/belize/northern-belize/orange-walk-town/sights-and-recreation/new-river-and-new-river-lagoon