Some tips for visiting Pena Palace from Lisbon:

• The train from Lisbon is super cheap, around €5 for a return ticket. Trains run twice an hour, they get pretty busy so get there early to avoid standing for 45 minutes
• When you arrive in Sintra, there are quite a few options for what to do, if you just want to visit Pena Palace then get a taxi
• There are two different tour buses which are €20 each and offer a hop on hop off service
• I recommend just getting a taxi as it works out cheaper because Pena Palace might take you the whole day
• The palace is €7 to get into the gardens or €15 to get into the palace and gardens
• The busiest time is the mornings, the queue to go around the inside of the palace is long in the morning
• If you only want to take pictures of the outside then just buy a ticket for the grounds
• If you pay to go inside the palace, no photos are allowed, if you go in the morning it is very over crowded

After lunchtime the crowds ease up

It is very easy to spend the whole day here wondering around