nearly every central coffeeshop has free rollingpapes and filter-tips for u.
no problem if u grab some more.
there are also a few vapos around (dont know them all), i like 420cafe and la tertulia.
good shops are also dampkring,barneys,greenhouse,grey area ... etc. check out ur self
maybe u could find a good bus travel, but i think train will be better:
take the train to and from amsterdam to airport, it's only 20 mins and its 20x cheaper then a taxi and just as fast and comfortable.
most of the nicer coffee shops have some bongs and maybe a vaporizer for customers to use, just ask at the counter. they will all supply you with papers and filter tips, some places have shity acrylic bongs, but with a bit of research you can find the places that have nice glass to use, just check the coffee shops internet site and you will be able to find out. some even have the menu online.
the airport has it's own train station. but if you have info about a bus from your hotel or near by that's cool too, just don't waste the cash on a taxi.
You´re travelling with rainbow tours, aren´t you?! I think I´ve been in the same hotel
The hotel has a free shuttle service to schipol and it´s easy and cheap to take the next train to the center.
Have fun!