Its not enough to just tell them you love them... you need to express yourself and let them know you really care for them and love them. Here are some wonderful, heartwarming ideas that would definitely add more to your romance.
Look into each other's eyes holding hands. Guys, you could kiss her hand and then put it over your heart.
Hold hands and watch the sunset together. Tell him/her how wonderful you feel just to be with him/her.
Go out for a romantic movie and remember the parts he/she liked.
Put love notes in their pockets when they aren't looking and when they discover these notes afterwards... well you are in for some wonderful times!
Whisper sweet nothings to each other. You could even learn to say sweet things in foreign languages.
Make excuses to call them every time, or you could even email some lovey-dovey lines every time you feel like. Call from your holiday spot to tell them you were thinking about them.
Let him/her fall asleep with their head on your shoulders. Very lightly push up her chin, look into her eyes, tell her you love her, and kiss her lightly.
Write poetry for each other or just cute little 'I love you' notes. Try and be innovative like you could write it such that they have to hold it in front of a mirror to read it!
Remember your dreams and tell him/her about them. Tell each other your most sacred secrets/fears.
Gift them random gifts like flowers, chocolates, cards and so on. Guys, buy her a ring.
Dedicate songs to them on the radio or even sing to them a love song! Uh... well but just remember it is supposed to be romantic and not rock'n'roll!
Find out their favorite cologne/perfume and wear it every time you're together.
Always hold her around her hips/sides. Find excuses to hold hands.
Dance together. A slow and soft romantic melody or a wild latino number...any of the two would be perfect!
Walk in the rain without saying a word... sometimes, you say best when you say nothing at all!
Take her to dinner and share a single dish or the dessert. Or how about cooking for each other?
Hugs and kisses... you just cant do without these essential ingredients of romance! Never ever forget to kiss goodnight!
Always tell her how pretty she looks. Brush the hair from her face on a windy day.
Go for a long walk down the beach at midnight.
Make sacrifices for each other. Stand up for them when someone talks trash.
Say I love you, only when you mean it and make sure they know you mean it!