A gradual approach
So if your child is resisting your usual routine times, we recommend you take a gradual approach rather than try to insist that they sleep at times they have become un-used to. For example, if your toddler has got used to bedtime at 9pm while you were camping, trying to put him into bed at 7pm as soon as you get home will likely result in a huge tantrum! His body clock is telling him that there are 2 more hours of fun to be had, so it's no wonder he springs straight back out of bed or just screams his head off in the cot.
So a gradual approach would mean shifting the 9pm bedtime forward by 15 minutes per night over a week or so. At the same time, work on re-establishing your usual bedtime routine practices, such as a bath an hour before bedtime, followed by cuddles and 3 stories, then listen to some relaxing music in bed.
Solving several issues at once
If you are tackling other holiday sleep issues at the same time, eg wanting mum or dad there at bedtime, you may want to get the bedtime as close to normal before you start on addressing the bigger issues. This will mean you have some more time up your sleeve at bedtime and you will also be less likely to have an over-tired child on your hands at bedtime.
With daytime sleeps, you may also find some resistance to returning to earlier sleep times. Again just take a gradual approach and appreciate that your child may also need a bit of help to get used to sleeping in their bed again if they have been taking their naps in the pushchair or car while you have been away.