Tikal will be lots easier to plan than Chet and much much more interesting. Chet has a maya musuem with lots of replicas, which is fine if you'll never be able to get to the real thing. Both Maya and Tropic offer Tikal packages with air, tranfers, guides, etc. Or see Lamanai from San Pedro. Or Altun Ha. Any of these have to be a better plan than a vacation dayin Chet.