Cahal Pech San Ignacio Belize
This is a Mayan ruin that is within the city limits of San Ignacio. It is a day trip and easily done in 2 hours. Spend a little more time if you need too.
There is a museum at the beginning. It’s really small but has some nice artifacts. It doesn’t cost a lot to get in. $5 u.s. dollars if that.