A suggestion that combines jungle with San Ignacio, though might be a bit rustic, is Parrot Nest Jungle Lodge. They are about 3 miles and a $7 US cab ride out of San Ignacio, if I remember right. They are very inexpensive, and the experience is terrific. Beautiful setting, right in the jungle on the banks of the Mopan, and the family is terrific! The biggest draw for me - several of their rooms are actually "treehouses" - up a tree, but with steps, not ladder, to get up. Fell asleep in our tree to the sounds of howler monkeys, and woke up to a gibnut wandering right below. A unique and amazing experience.