Quitrent é censo ou foro... Mas não sei o que isso tem a ver com o turismo. Nos dicionários que eu verifiquei aqui, isso é um valor que é pago em substituição de serviços que deveriam ser prestados.
Veja no Random Webster Unabridged Dictionary:
"rent paid by a freeholder or copyholder in lieu of services that might otherwise have been required."

pay rent or quit the premises
OR
or Pay rent or quit the premises...



from colonial times:

The term "Quit rent" is one that was used in Colonial America to refer to a
personal property tax, which was assessed by the Crown. The local Sheriff
collected it, and it was sent to the Governor for distribution and
administration. It was paid in cash or tobacco. It was one of the "Taxation
Without Representation" issues leading to the Revolution, after which it
was abolished.

Original on file at the North Carolina Archives, Raleigh, NC

The far right column has three columns for the numbers - the ":" symbol is
used to seperate them. Also, the same symbol was used a few times in the
document.

Patentee, No of Acres, Date of Patent, Last Rent, When paid

Uma sugestão.

A Quit rent (quietus reditus) is a yearly payment made from time immemorial by freeholders or copyholders of a manor to the lord. The term implies that the tenant thereby becomes free and quit from all other services.

http://40.1911encyclopedia.org/R/RE/RENT.htm

quit (adjectivo predicativo) = quite, livre, liberto;
to be quit of someone estar livre de alguém

quitação (substantivo feminino) =

1. acto ou efeito de quitar;

2. desobriga de uma dívida;

3. recibo que se entrega quando o devedor liquida a sua dívida;

Veja este texto, de http://www.rootsweb.com/~srgp/articles/lthomas.htm

"It is interesting to me to think of land values. William Penn attracted settlers from England and Europe by offering land at forty shillings per one hundred acres, with the obligation on the buyer to pay and additional one shilling per year for each one hundred acres. I am not sure, but I think this "quit rent tax" went to the Crown. At least it was customary as a token of the Crown’s supreme sovereignty. Land was cheap sure, but damned hard to clear!"

Parece tratar-se de imposto que alguém pagava por se haver livrado do aluguel, ao ir para a nova colônia.

O assunto parece me bastante delicado mas parece que a taxa de alteração seja a tradução mais proxima

MUDANÇAS
Caso seja possível, sempre que um cliente inscrito em determinada viagem deseje alterá-la (para outra viagem ou para a mesma com partida em diferente data), deverá pagar uma taxa de alteração. Contudo, caso a referida mudança venha a ocorrer em período inferior a 22 dias da partida, ou os prestadores de serviços venham a rejeitar tal alteração, fica o cliente sujeito às despesas e encargos previstos na rubrica «Desistências».