We will be travelling through Yucatan and Chiapas in addition with Guatemala, OK! now few remarks.
we read several LP pages herewith of travellers who went through Belize. Comments.
Belize is expensive.
Belize doesn't provide friendly local atmosphere (tourist is seen only as a wallet)
Belize hasn't nice beaches along the coasts only oversea, which means you need a boat ( or go by boat)
Belize (keys) or islands are sort of natural wealthy US people reserve
Islands or keys might be nice ( diving & snorkel nice though but very expensive) but boring rest of the time- better to bring your girlfriend-
Belize is rather dirty.
Belize gastronomy is limited.
Transports are expensive even complicate
the old capital (even dangerous at night) and the new one aren't worth a visit Dandriga is a lost hole.
Ok, 2 places seem to be worth a visit, ATM (I love that, so helpful acronym,I thought it was a DAB) and Caracol (though after being to the most well-known one in Yucatan, we are wondering if we won't be disappointed.
last and not least, Mosquitoes seem to be everyday companions.
Please don't be upset by this message which wasn't written with this intention, but only to know, if travelling to Yucatan to Tikal it is worth to go through Belize. However we understand as Belize is an English speaking country, American prefer it probably to Mexico, Guatemala or Nicaragua.
Thanks for your details answers.

