The paddling in Jalcolmulco (near Veracruz) is great for any level. There tons of water falls north of there too in Valles, S.L.P Mexico. The season there is usually Nov.-Feb. If you are driving it is a full day closer to Valles. There is an awesome crew there in Valles that runs shuttles and has tons of beta on everything including camping/hotels ect. Adventura Huasteca is the name of the Co., The woman who runs it is Ena.
If you are doing a long trip to Veracruz, it is worth your while to check both areas out!