For the man with an active lifestyle, this Casio sportswatch would make a great Valentine's day gift. It has an altimeter feature, barometer, thermometer, and tide and moon data. It also has a digital compass making it a great companion when going camping or trekking up in the mountains. This is also water-resistant up to 660 feet or 200 meters. And it looks quite good too!
Price: $400, on sale for $243.39 for Valentine's Day