Can I stay in Thailand for 90 days using a tourist visa with an extension?

The user is seeking clarification on whether they can obtain a 90-day stay in Thailand by entering on a 60-day tourist visa and then applying for a 30-day extension. Comments confirm that this is possible, as tourists receive 60 days upon arrival and can extend for an additional 30 days at a local immigration office, including a specific mention of the Blue Tree office near Laguna. There is also a discussion about the implications of having a return ticket that is later than the initial visa duration, and opinions indicate that immigration rarely questions such arrangements unless there's a significant history of previous entries.