Thank you both for your recommendations. I am not familar with Daniel Nunez of Tanisha, so I can't speak about him. We used Searious several times last March and went with Willie to Altun Ha/Maruba and also the Manatee/Goff's Caye/Caye Caulker day trip. Willie is a great tour guide and a funny, kind soul. I will probably go with Searious to Lamanai but wanted to check around for some other possibilities. (Don't want to miss the opportunity to broaden my horizons!) Thanks so much again.
Anybody else out there with another recommendation?