hi - i read that SEArious river adventures does a day trip from AC to the spa up river stopping at altun ha. it stops for lunch at maruba spa and offers choice of pool, horseback riding, massage or mud bath. drinks on boat are included (min 6 guests) for $60 US pp, i don't think that includes price of spa treatment. i found this on their web site a few days back. i thought this sounded like a great day.