Airport & Shuttle - $10 to $20 for the baggage handler to negotiate your bags into the parking lot and onto the van and another $10 or $20 for the driver to take you to the dock.
TIR Tips - you can put these on your Visa or MasterCard (no Am Ex) account on the island if you want. There's a suggested tipping sheet that will be waiting for you in your room. I can't remember the suggested amounts exactly, but tips are suggested for the dive staff boat captain and dive master, cleaning ladies/kitchen crew, the bartender and, somewhat controversially per a prior thread, the maintenance and landscape crews.
I plan to tip in cash to the dive guys and bartender and put the rest on my credit card when we go in a couple of weeks.
Other than tips, you won't need any cash at TIR at all as there's literally nowhere to spend it. You do need to bring a credit card, though, which you'll use to charge drinks, the Blue Hole park fee, rental gear, nitrox, any gift shop stuff, etc. You'll set up an account shortly after you arrive.
Lamanai Mayan ruins - not sure about this one. We're going to do this tour on Friday before we head off to the island the following afternoon. First, there's the driver, who will also act as your guide. I think the driving is about an hour each way. Then there's the boat captain for the forty mile round trip on the New River. I assume the boat captain hangs around while you clamber about the ruins, so this is a pretty big commitment from both of these people.
This will be a private drive, ride and tour since it's arranged through TIR, so I think the tips should be bigger than if you were just one of many on a tour bus and a cattle boat. I tipped my driver/guide somewhere around $50 or $60 each time for two half-day trips two years ago.
I'm guessing I'll probably tip our driver around $100 and maybe $60 for the boat captain. It's just a guess, though, and if anyone else thinks I'm ridiculously off the mark in either direction I'd appreciate the input. In our case, we're going to have the same driver for cave tubing and the Baboon Sanctuary the day before the Lamanai ruins plus a trip to the Zoo the morning after. This means we're going to be hanging with this guy for two and a half days. I'm planning on making this one happy guide from the start because in my experience a happy guide makes for happy tourists.
TIR departure - $10 or $20 for the driver. You'll be dropped off at the airport's front door so no need for a baggage handler this time.
Don't know about you, Dave, but I'm counting down the days at this point...15 days and about 3 hours till we touch down in beautiful BZ City, lol.
