If you have been out all day visiting places. Sometimes it is nice to buy some food from local supermarket and eat in hotel room and relax
If you eat where the locals eat, it is is usually cheaper than the tourist areas
Yes you do meet people of all ages when travelling - smile
With modern technology you will never be alone take mobile phone, lap top, i pad, blog about your travels via social media or keep a travel diary (good to look back on in the future) camera
Take a world travel adapter plug
Must have travel insurance
Good to have access to emergency source of money
Use free wi fi
Be wary of running up big bills via data roaming
Some hotels ask you to provide the paper booking form, even if you have pre paid before arriving via the internet
Be wary of people that try too hard to be "your friend", they may have be trying to scam or steal from you
Lots of people travel alone for business or pleasure - I hope you enjoy