Many people are easily tempted to collect credit cards. It doesn’t help that nowadays, almost all credit companies send pre-approved cards often with high credit limits. Unless the recipient has good sense of control over his/her spending, the risk starts once the credit card is made ready for use.
There is a company called Comparecards.com that helps to check for suitable credit cards depending on the financial standing and spending needs of a person. There are a lot of different types out there but what I would look out for is a low interest credit card.
Ideally though, the safest of all to use are pre-paid debit cards. Having to set a spending limit is easier than working to pay for credit interests alone.