The Pickwick Papers by Charles Dickens
This book is quite long, but the characters are very likeable and this has some memorable moments, particuarly:
*Mr. Pickwick going into a woman's room thinking it is his own and hiding behind the curtains
*The depiction of the debtor's prison after Mr. Pickwick refuses to pay a debt after being sued.
I started liking Mr. Pickwick and Samuel Weller a lot as I read through the book; this is not typical Dickens (e.g. Oliver Twist or Nicholas Nickelby), as it does not talk a lot about people living in slums or workhouses or losing loved ones.