Hello, I just returned from Belize and stayed at the Blue Tang and dove with Chuck & Robbie. I'll write up a trip report later but want to answer your question. I told Blue Tang I wanted to reserve with Chuck & Robbie for six days. They said that was fine but for whatever reason when I arrived there was no record of my reservation. So, they called Chuck & Robbie's and asked if they had room which they did. Each day that I dove, I went to the receptionist at Blue Tang and they gave me a voucher for a 2-tank dive. I gave the voucher to the dive shop and the diving was charged to my room. In retrospect, I liked this because I wasn't locked into anything even though I might have received a discount for a multiday package. The other benefit of doing it one day at a time is that, given that it's slow right now, it's possible that a dive shop might not go out just for one diver. There was one day when I was the only diver and we agreed to do just one tank. The other advantage of going one day at a time is that if you decide you want to go to the Blue Hole, you have to use another shop since Chuck & Robbie's doesn't go there. Or, if you want to do a land tour you can have that flexibility as well. So, all in all, the daily voucher system works well. You may get a lower cost if you book directly with Chuck & Robbie but you will have to pay them directly rather than having it charged to your room. So, it comes down to cost & flexibility. I liked having everything billed to my room but that's just me. One other note, it is slow in Belize right now. You might want to e-mail Chuck & Robbie's directly to see if they are operating the week that you are there. It is the slow season and some shops (diving, restaurants, etc.) may shut down for a few weeks due to the low traffic. I hope you can dive with Chuck & Robbie's because they were GREAT!