The Holland Pass is a MASSIVE scam, be very careful buying this for many reasons:
1. You need a printer to print it out before collecting pass, otherwise you wont get the pass, good luck finding a printer, accessing your emails in Amsterdam.
2. What you actually get if you buy the 2 ticket option.
1. Ticket 1, entry to ONE that's right ONE of the 100 listed attractions. And that's all the main attractions, so that's fine
2. Ticket 2, entry to some boring unknown museum / attraction
3. Free public transport for 1 day only
Now that may sound amazing to some poor, unsuspecting tourist, though let's just do the math.
Say I wanted to visit the Van Gogh Museum with the first ticket, 15 Euros (normal off the street entry fee)
Now let's say I wanted to visit the Rijksmuseum, oh no I already used the first ticket, The Rijksmuseum wont accept the second less valuable ticket.
Oh well, I guess I'll just go and visit some other, less known museum, very boring. Oh they all cost 10 Euros entry off the street.
So that would have cost me 15 Euros + 10 Euros + 5 euros for public transport if you use it.
So that's 30 Euros if I walked of the street, but I just spent 35 Euros on the Holland Pass.
You really need to be careful in Amsterdam, these scams are everywhere. It's a liberal city, a lot of freedom and a lot of freedom to rip off tourists. The Holland Pass is a government approved scam, so you can imagine how badly scammed you can get with a non-government approved scam in Amsterdam.